A 1.2516 gram sample of a mixture of CaCO3 and Na2SO4 was analyzed by dissolving the sample and completely precipitating the Ca2+ as CaC2O4. The CaC2O4 was dissolved in sulfuric acid and the resulting H2C2O4 was titrated with a standard KMnO4 solution. The titration required 35.62 mL of 0.1092 M KMnO4. Calculate the number of moles of H2C2O4 that reacted with the KMnO4. Calculate the number of moles of CaCO3 in the original sample. Calculate the percentage by weight of CaCO3 in the original sample.

Question
Asked Nov 25, 2019
93 views

A 1.2516 gram sample of a mixture of CaCO3 and Na2SO4 was analyzed by dissolving the sample and completely precipitating the Ca2+ as CaC2O4. The CaC2O4 was dissolved in sulfuric acid and the resulting H2C2Owas titrated with a standard KMnOsolution. The titration required 35.62 mL of 0.1092 M KMnO4. Calculate the number of moles of H2C2Othat reacted with the KMnO4. Calculate the number of moles of CaCO3 in the original sample. Calculate the percentage by weight of CaCO3 in the original sample. 

check_circle

Expert Answer

Step 1

A 1.2516 gram sample of a mixture of CaCO3 and Na2SO4 was analysed by dissolving the sample and completely precipitating the Ca2+ as CaC2O4. The CaC2O4 was dissolved in sulfuric acid and the resulting H2C2Owas titrated with a standard KMnOsolution. The titration required 35.62 mL of 0.1092 M KMnO4. Calculate the number of moles of H2C2Othat reacted with the KMnO4. The number of moles of CaCO3 in the original sample is to be calculated. The percentage by weight of CaCO3 in the original sample is to be determined. 

Step 2

From the mixture, CaCO3 is precipitated out as CaC2O4. Thus1 mole of CaC2O4 is precipitated by 1 mole of CaCO3. And this 1 mole of CaC2O4 is converted into 1 mole of H2C2O4.

Further H2C2O4 is titrated with KMnO4.

help_outline

Image Transcriptionclose

Reactions taking place are - СаC,0,+H,SO, > Н,С,0, ЗН,С, О, +2H +MnO, > Mn** + 4H,0 + 6C0,

fullscreen
Step 3

Calculate the moles of KMnO4 reacted:

Molarity of KMnO4 = 0.1092

Volume of KMnO4...

help_outline

Image Transcriptionclose

Moles of KMnO = Molarity of KM1O4 x Volume of KMnO, used =0.1092 M x 0.03 5 62 L = 0.0039 mole

fullscreen

Want to see the full answer?

See Solution

Check out a sample Q&A here.

Want to see this answer and more?

Solutions are written by subject experts who are available 24/7. Questions are typically answered within 1 hour.*

See Solution
*Response times may vary by subject and question.
Tagged in

Science

Chemistry

Inorganic Chemistry

Related Chemistry Q&A

Find answers to questions asked by student like you
Show more Q&A
add
question_answer

Q: Calculate the pH of a buffer of a mixture of 0.450 M propionate and 0.342 M propionic acid. Propioni...

A: Henderson equation,pH of the buffer solution is calculated by using Henderson equation, it is,

question_answer

Q: 5. Aqueous solutions of AX, BY, and BZ (where A and B are cations; and X, Y, and Z are anions) are m...

A: Precipitate is a substance that is deposited in solid form from a solution, as it is insoluble in wa...

question_answer

Q: “Ionic bonds are non-directional”. True or False? Explain?

A: Ionic bonds are strong electrostatic attraction forces formed between positive and negative ions. Th...

question_answer

Q: Calculate the standard enthalpy change for the fermentation process, in which glucose (C6H12O6) is c...

A:  Thermodynamic is the branch of chemistry that mainly deals with the heat transfer between system an...

question_answer

Q: Enter your answer in the provided box. Calculate the KP for the following reaction at 25°C:  H2(g) +...

A: Given valuesTemperature = 25°C                     = 298KΔG° = 2.60 kJ/mol

question_answer

Q: Police often monitor traffic with "K-band" radar guns, which operate in the microwave region at  22....

A: Given information,

question_answer

Q: Give the oxidation numbers for the specified atoms in the following molecules and ions.(a) Mg3N2   N...

A: (a)Mg3N2:N: Assume that the oxidation state of N = xOxidation sate of Mg = +2

question_answer

Q: How many grams of solid potassium hydroxide are needed to exactly neutralize 22.9 mL of a 0.688 M hy...

A: Number of moles of hydrobromic acid is calculated,

question_answer

Q: How many moles of bonds between which pairs of atoms are broken during the combustion of 3 moles of ...

A: The balance chemical reaction of combustion of methane gas is