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Pyrolusite (MnO2) is dissolved in hydrochloric acid: MnO2 + HCl → MnCl 2 + H2O + Cl 2 The chloride was passed into potassium iodide solution where it liberated iodine: 2 2 Cl + KI → KCl + I The iodine liberated was estimated by adding sodium thiosulfate, the reaction being 2 Na2 S2O3 NaI Na2 S4O6 I + → + If 5.6 g of crystallized sodium thiosulfate, Na2 S2O3  5H2O , were used up, how many grams of manganese were present? MW (g/mole): I =126.9; Mn =54.94; Cl = 35.45; K = 39.09; Na = 23; S = 32

Pyrolusite (MnO2) is dissolved in hydrochloric acid: MnO2 + HCl → MnCl 2 + H2O + Cl 2 The chloride was passed into potassium iodide solution where it liberated iodine: 2 2 Cl + KI → KCl + I The iodine liberated was estimated by adding sodium thiosulfate, the reaction being 2 Na2 S2O3 NaI Na2 S4O6 I + → + If 5.6 g of crystallized sodium thiosulfate, Na2 S2O3  5H2O , were used up, how many grams of manganese were present? MW (g/mole): I =126.9; Mn =54.94; Cl = 35.45; K = 39.09; Na = 23; S = 32

Chemistry for Engineering Students
Chemistry for Engineering Students
4th Edition
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter4: Stoichiometry
Section: Chapter Questions
Problem 4.98PAE
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Pyrolusite (MnO2) is dissolved in hydrochloric acid:

MnO2 + HCl → MnCl 2 + H2O + Cl 2

The chloride was passed into potassium iodide solution where it liberated iodine:

2 2 Cl + KI → KCl + I

The iodine liberated was estimated by adding sodium thiosulfate, the reaction being

2 Na2 S2O3 NaI Na2 S4O6
I + → +
If 5.6 g of crystallized sodium thiosulfate,
Na2 S2O3
 5H2O
, were used up, how many grams of

manganese were present?

MW (g/mole): I =126.9; Mn =54.94; Cl = 35.45; K = 39.09; Na = 23; S = 32

1. Pyrolusite (MnO2) is dissolved in hydrochloric acid: MnO, + HCI → MnCl, + H,0+ Cl, The chloride was passed into potassium iodide solution where it liberated iodine: a, + KI → KCI + I, The iodine liberated was estimated by adding sodium thiosulfate, the reaction being 1, + Na,S,0, Nal + Na,S,0, If 5.6 g of crystallized sodium thiosulfate, Na ,S,0, - 5H,0, were used up, how many grams of manganese were present? MW (g/mole): 1=126.9; Mn =54.94; CI = 35.45; K = 39.09; Na = 23; S = 32 VERIT
Transcribed Image Text:1. Pyrolusite (MnO2) is dissolved in hydrochloric acid: MnO, + HCI → MnCl, + H,0+ Cl, The chloride was passed into potassium iodide solution where it liberated iodine: a, + KI → KCI + I, The iodine liberated was estimated by adding sodium thiosulfate, the reaction being 1, + Na,S,0, Nal + Na,S,0, If 5.6 g of crystallized sodium thiosulfate, Na ,S,0, - 5H,0, were used up, how many grams of manganese were present? MW (g/mole): 1=126.9; Mn =54.94; CI = 35.45; K = 39.09; Na = 23; S = 32 VERIT
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