4.35 g of a sample of pyrolusite when heated with conc. HCl gave chlorine. The chlorine then passed through KI solution liberated 6.35 g of iodine . Then% purity of the pyrolusite sample is?
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Expert's answer
2013-02-28T11:23:37-0500
Pyrolusite is compound with formula MnO2.
It can react with HCl with chlorine producing:
MnO2 + 4HCl --> MnCL2 + CL2 +2H2O.
The reaction of Cl2 with Ki is next:
Cl2 +2KI=2KCl + I2
Using this equations it is possible to find mass of MnO2
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