Assume that you had a mixture of solid na2co3 and nacl. could you use only h2so4 to determine whether na2co3 was present. explain.

Answers

Answer 1

The presence of sodium carbonate can be identified by adding some sulphuric acid. The carbonates will produce carbon dioxide and it can be identified by the brisk effervescence.

What is sodium carbonate?

Sodium carbonate is an inorganic compound formed from the sodium metal and carbonate ions. It is basic in nature due to the presence of electron  rich carbonate anion.

Sodium carbonate will reacts with acids and neutralise them to form salts. It is a weak acid and thus ionization and conductivity of its electrolyte are weak.

Sodium carbonate react with sulphuric acid gives carbon dioxide, water and sodium sulphate. The carbon dioxide formed there will evolves as gas and produce brisk effervescence.

Therefore, by the  brisk effervescence formed in the reaction we can identify the presence of sodium carbonate in the mixture.

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Related Questions

The United States is one of the few countries in the world which has not yet adopted the metric system for general use. True or False

Answers

 think its true hope this helps

This is correct. Most countries use the Metric or Decimal system, however, the United States uses the US standard system. Hope it helps!

The titration of 25.00 ml a 0.125 m hclo4 solution requires 27.07 ml of koh to reach the endpoint. what is the concentration of the koh

Answers

Answer : The concentration of the [tex]KOH[/tex] is, 0.115 M

Explanation :

Using dilution law,

[tex]n_1M_1V_1=n_2M_2V_2[/tex]

where,

[tex]n_1[/tex] = basicity of an acid = 1

[tex]n_2[/tex] = acidity of a base = 1

[tex]M_1[/tex] = concentration of [tex]HClO_4[/tex] = 0.125 M

[tex]M_2[/tex] = concentration of KOH = ?

[tex]V_1[/tex] = volume of [tex]HClO_4[/tex] = 25 ml

[tex]V_2[/tex] = volume of NaOH = 27.07 ml

Now put all the given values in the above law, we get the concentration of the [tex]KOH[/tex].

[tex]1\times 0.125M\times 25ml=1\times M_2\times 27.07ml[/tex]

[tex]M_2=0.115M[/tex]

Therefore, the concentration of the [tex]KOH[/tex] is, 0.115 M

The concentration of 27.07ml of KOH solution requires to titrate 25mL of 0.125 M HClO₄ is 0.115 M.

How do we calculate the concentration?

Concentration of any solution in the titration will be calculated by using the below equation as:

M₁V₁ = M₂V₂, where

M₁ & V₁ is the molarity and volume of HClO₄ and M₂ & V₂ is the molarity and volume of KOH solution. Now putting values from the question on the above equation, we get

M₂ = (0.125)(25) / (27.07) = 0.115 M

Hence required concentration of KOH is 0.115M.

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Light travels in _______.
A.
circles
B.
waves
C.
electricity
D.
opaque objects

Answers

should be C. I think

Use the periodic table to answer this question: are the properties of rubidium (rb) more similar to cesium (cs) or those of strontium (sr)

Answers

cesium
they are in the same group

In the reaction B + KL + H, if an additional B is added, the result will be _____.

more K will be produced
more L will be required
the reaction will slow down
more L and H will be produced

Answers

The answer is D.
more L and H will be produced

Answer is: more L and H will be produced.

Balanced chemical reaction: B + K → L + H.

According to Le Chatelier's Principle, the position of equilibrium moves to counteract the change.

The position of equilibrium will move so that the concentration of B decreases again, by reacting more and produce L and H, reaction is going to be more in forward direction.

the weight of an object is constant. true false

Answers

false weight is dependent on the force of gravity 
 

Gold has a molar mass of 197 g/mol. (a) how many moles of gold are in a 3.98 g sample of pure gold? (b) how many atoms are in the sample?

Answers

A.)49.4974874 moles or 49.5 moles
B.)2.980808730172671e+25 or 3e+25

A student has two substances at a lab table. One substance is iron pyrite (fool's gold) and the other is real gold. After placing a 20.0-gram sample of iron pyrite into 40.0 mL of water in a graduated cylinder, it displaces 4.0 mL of water. The density of real gold is almost 4 times larger than iron pyrite. If a 20.0-gram sample of real gold is placed into the same amount of water, approximately how much water will be displaced?
A) 1 mL
B) 4 mL
C) 16 mL
D) 20 mL

Answers

The answer is A) 1 mL 

Answer:The correct answer is option A.

Explanation

Mass of the iron pyrite= 20 grams

Volume water displaced by the iron pyrite = 4 mL

Density of iron pyrite=[tex]d_i=\frac{Mass}{Volume}=\frac{20 g}{4 mL}=5 g/mL[/tex]

[tex]d_g=4\times d_i[/tex](Given)

[tex]d_g=4\times 5 g/mL=20 g/mL[/tex]

Mass of gold = 20 g

Volume of water displaced by the 20 grams of water = V

[tex]D_g=20 g/mL=\frac{20 g}{V}[/tex]

V = 1 mL

20 grams of gold will displace 1 ml of water.So, the correct answer is option A.

Why is gunshot residue important for a forensic scientist? What are the potential complications with this type of evidence?

Answers

A residue from a gunshot is most likely gun powder, which tells you what kind of bullet was shot and the type of gun that was used to shoot the target/victim/person. Some complications may be that there is more than one gun or weapon which uses that residue, so it may be hard to pinpoint it and the bullet can't really tell you who it is unless there's DNA on the bullet, and the chemicals of the bullet may even destroy evidence.

Answer 1: A gun shot residue is the powdery discharge that release after the firing process of the firearm. The powdery discharge consists of unburnt or partially burnt primer, propellants, fragments of the projectiles, cartilage cases  and residues present inside the firearm.

It is important for the forensic scientists so as to detect the culprit as these residues are left on the clothes and hands after firing. It can be used to identify the direction and distance of firing.

Answer 2: The complications associated with gunshot residue are:

1. The particles are very small and may exhibit low density they are likely to blow by wind so they may not be found at some crime scene.

2. As the powdery discharge consists of explosive particles in small amounts but on testing can explode and can cause harm.

Nic bought 12 pens for 2$ each and 12pads of paper for 3$ each. Write two expressions for how nic could calculate his total.Write one expression in expanded form and one in factored form.

Answers

12 pens for writing chemical formulas cost
12*2=24 dollars
12 pads cost
12*3=36 dollars
1)
12*2=24
12*3=36
2)
12*2+12*3=60 dollars
3) 12*(3+5)=60 dollars

Compare and contrast an ionic bond with a polar covalent bond

Answers

Ionic Bond occurs between non metal and metal ions and covalent Bond occurs in non metal and non metal elements

In the water cycle, which state of matter has the particles closest together? solid liquid gas plasma

Answers

The state of matter in which particles are closest together is a solid. This is most easily described by thinking of it in terms of the solid being formed into a particular fixed shape, made possible by the fact the particles are packed tightly, whereas say, a liquid, has loosely packed particles and is free to flow and move (even looser in the case of gases and plasmas)

Answer:

solid

Explanation:

Why is a neutral iron atom a different element than a neutral carbon atom?

Answers

Atomic number. In all atoms the distinct properties of that atom are a result of the number of protons that atom is composed of. A carbon atom has six protons, while an iron atom has 26.

Do you know how to do this? if you have 4 grams of carbon-14, how much carbon 14 remains after 11,460 years? the half life is 5,730 years.

Answers

Carbon dating has given archeologists a more accurate method by which they can determine the age of ancient artifacts. The halflife of carbon 14 is 5730 ± 30 years, and the method of dating lies in trying to determine how much carbon 14 (the radioactive isotope of carbon) is present in the artifact and comparing it to levels

Pellets of calcium chloride are spread on a sidewalk covered in water that is 36°C. Under which circumstance will the calcium chloride dissolve faster?

Answers

People walking on the sidewalk crushthe calcium chloride pellets.

Answer:

In case if the pellets of the calcium chloride gets crushed.

Explanation:

When the pellets of calcium chloride get crushed it enhances the surface area of the compound. With the increase in surface area, the number of collisions in between the molecules of reactants increases. In the given case, the reactant molecules are water molecules and calcium chloride ions. In the procedure of dissolution, the calcium chloride ions get hydrated by the water molecules dipoles. As the frequency of the collision enhances, the activation energy gets lowered in order to begin the reaction.

Which sample of copper has atoms with the lowest average kinetic energy?

Answers

I believe your answer is 40g 15*C I hope that helps.

why does your reflection in a mirror look different from your reflection in wood

Answers

The surface of a mirror is smoothly and therefore the rays of light are reflected with the same angle they hit the surface. The surface of a piece of wood on the other hand has a lot of microscopical imperfections and hence the rays of light are reflected in multiple directions.

Final answer:

The reflection in a mirror looks different from the reflection in wood because mirrors have smooth surfaces that reflect light at specific angles, while wood and other rough surfaces diffuse and reflect light in many different directions.

Explanation:

When we look at our reflection in a mirror, we see a clear and accurate representation of ourselves because mirrors have smooth surfaces that reflect light at specific angles. On the other hand, when we look at our reflection in wood or other rough surfaces, the light gets diffused and reflected in many different directions, causing distortions and a less accurate reflection.

WILL MARK AS BRAINLIEST
Name the following ionic compounds.

Answers

1) Magnesium Chloride 
2) Sodium Bromide 
3) Magnesium Oxide
4) Nickel (III) Fluoride 
5) Aluminum Chloride
6) Rubidium Sulfide
7) Gallium Nitride
8) Calcium Sulfide
9) Lead (IV) Oxide
10) Cobalt (II) Oxide
11) Beryllium Sulfide
12) Cesium Nitride

Define and then describe the difference between a polar covalent bond, nonpolar covalent bond and ionic bond.

Answers

Polar covalent bond-  a bond where atoms are unevenly shared due to a larger difference in electronegativity of the bonded elements.

Non-polar covalent bond- These are bonds between elements with a low difference in electronegativity. Electrons are shared equally in these bonds between the elements.

Ionic bonds- have such  large difference in electronegativity that they take/give electrons to the element they are bonded to. They do not share electrons at all. Bonds between a non-metal and a metal.

What did Dmitri Mendeleev contribute to science

Answers

Mendeleev created the Periodic Table of the Elements, one of the most fundamental parts of science. 

He arranged the first periodic table?

Calcium chloride contains calcium and chloride ions. write the ground-state electron configuration for the chlorine ion.

Answers

The electron configuration of an atom of Chlorine Cl (neutral Chlorine) is:

1s2 2s2 2p6 3s2 3p5

 

Now if the Chlorine becomes an ion, it becomes Cl-. So we can see that 1 electron is added therefore the new electron configuration is:

1s2 2s2 2p6 3s2 3p6

How many orbitals are possible in the third energy level?

Answers

There are 9 orbitals in the third energy level. 

If cacl2 is dissolved in water, what can be said about the concentration of the ca2+ ion? hints if is dissolved in water, what can be said about the concentration of the ion? it has the same concentration as the cl− ion. its concentration is half that of the cl− ion. its concentration is twice that of the cl− ion. its concentration is one-third that of the cl− ion.

Answers

The answer to this question would be: its concentration is half that of the cl− ion.

When CaCl2 molecule dissolved, it will split into one Ca2+ ion and two Cl- ion. That means for every 1 CaCl2 there will be 3 ions formed. In this case, the amount of Ca2+ should be half of Cl- ion. An element with higher valence tends to have less atom in a molecule than an element with lesser valence electron.


When does water act as an acid and a base?


Water can donate a proton to become a hydronium ion or hydroxide ion.

Water can accept a proton to become a hydronium ion, or donate a proton to become a hydroxide ion.

Water can accept a proton to become a hydronium ion or a hydroxide ion.

Water can donate a proton to become a hydronium ion, or accept a proton to become a hydroxide ion.

Answers

I believ it is B. A water molecule donates a proton. I hope this helps
I believe the answer is B. Water can accept a proton to become a hydronium ion, or donate a proton to become a hydroxide ion.
When water accept aproton, it will create this equation:
H2O + H+ -> H3O+       . . . . (H3O+ is the hydronium ion)

When water donate proton. it will create this chemical equation:
H2O -> H+ + OH-   . . . . . .  (OH- is the hydroxide ion)

How many grams of h2 are needed to react with 48 grams of o2, given the reaction: 2 h2 (g) + o2 (g) --> 2 h2o (l)?

Answers

1.Calculate the number of mole of O2: 48/32=1.5 mol
2.Calculate the number of mole of H2 by mole ratio: 1.5 x 1/2=0.75 mol
3.Calculate the answer:
0.75 x 2=1.5g
Final answer:

The stoichiometric equation shows that 2 moles of H2 react with 1 mole of O2. In this scenario, 48 grams of O2 is equivalent to 1.5 moles. Therefore, 1.5 moles of O2 would react with 3 moles of H2, which is equivalent to 6 grams.

Explanation:

To solve this question, we must first understand the stoichiometric relationship that exists between H2 and O2 according to the given equation: 2 H2 (g) + O2 (g) --> 2 H2O (l). What this equation shows is that 2 moles of H2 react with 1 mole of O2.

Next, we must convert grams of O2 to moles, using its molar mass. The molar mass of O2 is 32 g/mol, so 48 grams of O2 is equivalent to 48 g / 32 g/mol = 1.5 mol.

Then we use the stoichiometric relationship to calculate the moles of H2 needed. As per the reaction, 1 mole of O2 reacts with 2 moles of H2, hence 1.5 moles of O2 would react with 2*1.5 = 3 moles of H2. Finally, convert the moles of H2 to grams, using its molar mass (2 g/mol). So, 3 mol * 2 g/mol = 6 g. Therefore, 6 grams of H2 are needed to react with 48 grams of O2.

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Sodium, a group 1 element with an electron configuration of 1s22s23s1, will form a _____ ion in a chemical bond ?

Answers

Sodium loses an electron, so it forms a positive ion

What precautions must be taken when handling 0.5 m hcl and 0.3m koh solutions in the laboratory?

Answers

The precautions we take to handle these solutions is to wear safety goggles, lab coat and also the hand gear (this is also important).

KOH (potassium hydroxide), which is a strong base and HCL (hydrochloric acid) which is a strong base and both these solutions dissociates completely in water. So, whenever you are working in laboratory with chemicals you must be careful.


The wavelength of the characteristic, bright yellow-orange flame test color of sodium is 590 nm. Calculate the average energy (ΔE) associated with this atomic emission line.

Answers

The energy associated with the 590nm atomic emission line is 3.369 x 10^49 Joules. This can be determined by multiplying Plank’s constant (6.626 x 10^34 Js) by the speed of light (3x 10^8 m/s), and then dividing the result by the wavelength (590 x 10^-9 m).

Final answer:

The average energy associated with the atomic emission line of sodium with a wavelength of 590 nm is calculated using Planck's equation, resulting in an energy of approximately 3.37×10-19 Joules per photon.

Explanation:

The question asks for the calculation of the average energy (ΔE) associated with the atomic emission line of sodium, which has a wavelength of 590 nm. To calculate this, we use the Planck's equation ΔE = h⋅c / λ, where h is Planck's constant (6.626×10-34 J⋅s), c is the speed of light in a vacuum (3.00×108 m/s), and λ is the wavelength in meters.

To convert the wavelength from nanometers to meters, we use the conversion 590 nm = 590 × 10-9 m. Substituting the values into the equation gives us ΔE = (6.626×10-34 J⋅s) ⋅ (3.00×108 m/s) / (590×10-9 m), which calculates to an energy of about 3.37×10-19 Joules per photon.

What is a double bond?

Question 4 options:

two covalent bonds between adjacent molecules

a total of two covalent bonds in a molecule

two covalent bonds between adjacent atoms in a molecule

a total of two covalent bonds between molecules

Answers



If we look at a Lewis structure of ethane, we can see that it looks like this

H H
I I
C = C
I I
H H

Now this is 1 molecule of ethene, but it has multiple bonds that total more than 2. So, this dispels options answers 2 and 4. When we look at bonds, we rarely look in terms of totals.

Now, it can’t be answer 1, because molecules don’t bond together. They can stick together and pack themselves in more densely, but they NEVER bond. At that point you’re creating a brand new molecule.

The answer, then, is 3, because looking at this Lewis structure, we can see 1 double bond between the two atoms of Carbon.

The answer is A

Two covalent bonds between adjacent molecules

Hope it helps you

What are the most reactive metals found on the periodic table?

Answers

Group I alkali metals are the most reactive metals found on the periodic table.
Caesium is the most reactive. It is found in the far corner of the periodic table, and it is the most reactive metal in the entire thing. It is even more reactive than Francium. This is a radioactive element and it decays. Caesium is more reactive than this, so those would be the top two. I don't know the third most reactive though sorry... 

I hope this helped! :)
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