QUESTIONS 1. Consider the balanced ionic equation for the reaction in today\'s e

Question

QUESTIONS 1. Consider the balanced ionic equation for the reaction in today's exercise: 5C O. 16 H 2Mnoa 10CO. 2Mn 8H,O The Mnoi salt used is KMno.. the oxalate salt is NazCzoa and the acid is H2Sou. The Mn 2, K and Na all react to form three different sulfate salts. Based on these facts, write the balanced molecular equation for the reaction. 2. Why is it not necessary to know accurately the volume of H2SO4 used in the reaction but is necessary to accurately know the volumes of KMno4 and Na2C20% solutions?

Explanation / Answer

1. Balanced reaction is :

5Na2C2O4 + 2KMNO4 + 8H2SO4 = K2SO4 + 2MnSO4 + 10CO2 + 8H2O + 5Na2SO4

2. In this oxidation and reduction reaction KMNO4 oxidises Na2C2O4. As they directly react with each other, it is necessary to known they amount exactly (they will react in 5 : 2 ratio). However, H2SO4 is used to make the medium acidic and it does not directly take part in oxidation-reduction reaction. Thus its amount need not to be measured accurately.

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