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When barium peroxide is reacted with dilute sulphuric acid, an aqueous solution of hydrogen peroxide is obtained. Ba02 (s) + H₂SO4 (aq) → BaSO, (s) + H,Oz (aq) 2.20 g of a sample of impure barium peroxide was reacted with excess sulphuric acid. The mixture was filtered and the barium sulphate on the filter paper was rinsed with distilled water. The filtrate and rinsing, which contained aqueous hydrogen peroxide were made up to 250 cm³ in a volumetric flask. 25.0 cm³ of the hydrogen peroxide solution was pipetted into a conical flask followed by 10 cm³ of dilute sulphuric acid and the mixture was titrated with 0.0210 mol dm³ potassium manganate(VII) and required 22.80 cm³. aqueous 2MnO (aq) + 5H₂O₂ (aq) + 6H (aq) →→2Mn² (aq) + 50₂ (g) + 8H₂O(l) (a) Calculate the number of moles of hydrogen peroxide in the volumetric flask. (b) Calculate the mass of pure barium peroxide in the sample used and thus calculate the percentage purity of the sample.

When barium peroxide is reacted with dilute sulphuric acid, an aqueous solution of hydrogen peroxide is obtained. Ba02 (s) + H₂SO4 (aq) → BaSO, (s) + H,Oz (aq) 2.20 g of a sample of impure barium peroxide was reacted with excess sulphuric acid. The mixture was filtered and the barium sulphate on the filter paper was rinsed with distilled water. The filtrate and rinsing, which contained aqueous hydrogen peroxide were made up to 250 cm³ in a volumetric flask. 25.0 cm³ of the hydrogen peroxide solution was pipetted into a conical flask followed by 10 cm³ of dilute sulphuric acid and the mixture was titrated with 0.0210 mol dm³ potassium manganate(VII) and required 22.80 cm³. aqueous 2MnO (aq) + 5H₂O₂ (aq) + 6H (aq) →→2Mn² (aq) + 50₂ (g) + 8H₂O(l) (a) Calculate the number of moles of hydrogen peroxide in the volumetric flask. (b) Calculate the mass of pure barium peroxide in the sample used and thus calculate the percentage purity of the sample.

Chemistry: Principles and Reactions
Chemistry: Principles and Reactions
8th Edition
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter4: Reactions In Aqueous Solution
Section: Chapter Questions
Problem 71QAP: Calcium in blood or urine can be determined by precipitation as calcium oxalate, CaC2O4. The...
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When barium peroxide is reacted with dilute sulphuric acid, an aqueous solution of hydrogen peroxide is obtained. Ba02 (s) + H₂SO4 (aq) → BaSO, (s) + H2O2(aq) 2.20 g of a sample of impure barium peroxide was reacted with excess sulphuric acid. The mixture was filtered and the barium sulphate on the filter paper was rinsed with distilled water. The filtrate and rinsing, which contained aqueous hydrogen peroxide were made up to 250 cm³ in a volumetric flask. 25.0 cm³ of the hydrogen peroxide solution was pipetted into a conical flask followed by 10 cm³ of dilute sulphuric acid and the mixture was titrated with 0.0210 mol dm potassium manganate(VII) and required 22.80 cm³. aqueous 2MnO (aq) + 5H₂O₂ (aq) + 6H (aq) →→2Mn² (aq) + 50₂(g) + 8H₂O(l) (a) Calculate the number of moles of hydrogen peroxide in the volumetric flask. (b) Calculate the mass of pure barium peroxide in the sample used and thus calculate the percentage purity of the sample.
Transcribed Image Text:When barium peroxide is reacted with dilute sulphuric acid, an aqueous solution of hydrogen peroxide is obtained. Ba02 (s) + H₂SO4 (aq) → BaSO, (s) + H2O2(aq) 2.20 g of a sample of impure barium peroxide was reacted with excess sulphuric acid. The mixture was filtered and the barium sulphate on the filter paper was rinsed with distilled water. The filtrate and rinsing, which contained aqueous hydrogen peroxide were made up to 250 cm³ in a volumetric flask. 25.0 cm³ of the hydrogen peroxide solution was pipetted into a conical flask followed by 10 cm³ of dilute sulphuric acid and the mixture was titrated with 0.0210 mol dm potassium manganate(VII) and required 22.80 cm³. aqueous 2MnO (aq) + 5H₂O₂ (aq) + 6H (aq) →→2Mn² (aq) + 50₂(g) + 8H₂O(l) (a) Calculate the number of moles of hydrogen peroxide in the volumetric flask. (b) Calculate the mass of pure barium peroxide in the sample used and thus calculate the percentage purity of the sample.
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