2. A dilute peroxide solution was prepared by quantitatively diluting 10 mL stock H2O2 (MW = 34.0147) to 250mL using a volumetric flask. 50 mL aliquot of the diluted peroxide solution was titrated using the previously standardized KMnO4 in problem 1. Titration of the sample required 29.00 mL titrant and the blank containing 50 mL 1:5 H2SO4 required 0.75 mL of the standard KMnO4. Calculate the concentration in %w/v of the stock H2O2. (Hint: H2O2 produces O2 under acidic condition).
Note: Follow rules of Sig Fig!
# 18.73 is incorrect
3. Which of the following is the likely label of the commercial H2O2 solution?
- 30 Volumes agua oxigenada - 40 Volumes agua oxigenada - 50 Volumes agua oxigenada - 100 Volumes agua oxigenada - 3 Volumes agua oxigenada - 10 Volumes agua oxigenada - 20 Volumes agua oxigenada # 30 volumes is incorrect 4. A 1.9300 g impure sample of Fe(NH4)2(SO4)2 (FW = 392.14) was dissolved in 75 mL 0.75 M H2SO4 and was titrated with the standard KMnO4 in problem 1. Titration of the sample required 24.00mL while the blank containing 75mL 0.75 M H2SO4 required 0.75 mL of the KMnO4 titrant. Calculate the concentration of Fe(NH4)2(SO4)2 in %w/w in the impure sample. # 8.75 is incorrect 5. Which of the following statements is/are FALSE? - KMnO4 solutions should be stored in an amber colored bottle protected by light to prevent oxidation
- MnO2 solids which may form during storage can be filtered out using a filter paper
- purple solution of KMnO4 in burette may be cleaned using oxalate or peroxide - the burette should be washed with the titrant first before titration - HCl cannot be used in place of H2SO4
- all statements are false
2. A dilute peroxide solution was prepared by quantitatively diluting 10 mL stock H2O2 (MW = 34.0147) to 250mL using a volumetric flask. 50 mL aliquot of the diluted peroxide solution was titrated using the previously standardized KMnO4 in problem 1. Titration of the sample required 29.00 mL titrant and the blank containing 50 mL 1:5 H2SO4 required 0.75 mL of the standard KMnO4. Calculate the concentration in %w/v of the stock H2O2. (Hint: H2O2 produces O2 under acidic condition).
Note: Follow rules of Sig Fig!
# 18.73 is incorrect
3. Which of the following is the likely label of the commercial H2O2 solution?
- 30 Volumes agua oxigenada - 40 Volumes agua oxigenada - 50 Volumes agua oxigenada - 100 Volumes agua oxigenada - 3 Volumes agua oxigenada - 10 Volumes agua oxigenada - 20 Volumes agua oxigenada # 30 volumes is incorrect 4. A 1.9300 g impure sample of Fe(NH4)2(SO4)2 (FW = 392.14) was dissolved in 75 mL 0.75 M H2SO4 and was titrated with the standard KMnO4 in problem 1. Titration of the sample required 24.00mL while the blank containing 75mL 0.75 M H2SO4 required 0.75 mL of the KMnO4 titrant. Calculate the concentration of Fe(NH4)2(SO4)2 in %w/w in the impure sample. # 8.75 is incorrect 5. Which of the following statements is/are FALSE? - KMnO4 solutions should be stored in an amber colored bottle protected by light to prevent oxidation
- MnO2 solids which may form during storage can be filtered out using a filter paper
- purple solution of KMnO4 in burette may be cleaned using oxalate or peroxide - the burette should be washed with the titrant first before titration - HCl cannot be used in place of H2SO4
- all statements are false
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