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What amount of K(2)Cr(2)O(7)(in mmol) is...

What amount of `K_(2)Cr_(2)O_(7)`(in mmol) is required to oxidise 24ml 0.05 M Mohr's salt?

Text Solution

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The number of Mohr.s salt in 24mL of 0.5M Mohr.s salt solution =24xx0.5=1.2
So the balanced redox reaction is .
`K_(2)Cr_(2)O_(7)+6(NH_(4))_(2)SO_(4).FeSO_(4).6H_(2)O+7H_(2)SO_(4)toK_(2)SO_(4)+6(NH_(4))_(2)SO_(4)+3Fe_(2)(SO_(4))_(3)+Cr_(2)(SO_(4))_(3)+43H_(2)O`
SO ,from the balanced equation ,w see that 6 mmol Mohr.s salt gets oxidised by 1 mmol `K_(2)Cr_(2)O_(7)`.
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