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: Principles and Reactions
8th Edition
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter16: Spontaneity Of Reaction
Section: Chapter Questions
Problem 92QAP
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Question
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
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
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