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The mass of potassium dichromate crystals required to oxidise 750 cm^3 of 0.6 M Mohr’s salt solution is (molar mass = 392)

The mass of potassium dichromate crystals required to oxidise 750 cm^3 of 0.6 M  Mohr’s salt solution is (molar mass = 392)

Grade:12

1 Answers

Sahil Yadav
32 Points
2 years ago

Amount of Mohr's salt oxidized is 0.75mL×0.6mol/l=0.45mol

K2​Cr2​O7​+6FeSO4​+7H2​SO4​→K2​SO4​+Cr2​(SO4​)3​+3Fe2​(SO4​)3​+7H2​O


For 6 mol of Mohr's salt 1 mol of Pottasium dichromate is required

For 0.45 mol of Mohr's salt,Pottasium dichromate required is 61×0.45​=0.075mol

Mass of potassium dichromate required is 0.075×294=22.05g

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