A $$60$$ ml sample solution of KI was electrolysed for $$579$$ $$sec$$ using a $$5$$ amp constant current. The produced, completely reacted with $$0.20$$ M sodium thiosulphate solution and unreacted KI solution required $$30$$ ml of $$0.04$$ M acidic solution of $$KMnO4$$. If the original molarity of KI solution can be expressed in scientific notation as Y × $$10-1$$. Calculate the value of Y.

Question

A $$60$$ ml sample solution of KI was electrolysed for $$579$$ $$sec$$ using a $$5$$ amp constant current. The   produced, completely reacted with $$0.20$$ M sodium thiosulphate solution and unreacted KI solution required $$30$$ ml of $$0.04$$ M acidic solution of $$KMnO4$$. If the original molarity of KI solution can be expressed in scientific notation as Y × $$10-1$$. Calculate the value of Y.

Infinity Learn · Accepted Answer

$$nF=579$$×$$596500=0.032I$$−→$$I2+2e$$−$$nF=2nI2nI2=00.015mol$$⇒$$nKI=0.03=30$$×$$10$$−$$3eI$$−$$=eKMNO4nI$$−$$=301000$$×$$.04$$×$$5=6$$×$$10$$−$$3$$[KI]$$=36$$×$$10$$−$$3$$×$$10360=0.6$$[KI]$$=6$$×$$10$$−$$1M$$

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