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A 50.0-mL sample of K2Cr2O7 solution oxidizes 1.500 g of Na2SO3 to Na2SO4. Cr2(SO4)3 is also...

A 50.0-mL sample of K2Cr2O7 solution oxidizes 1.500 g of Na2SO3 to Na2SO4. Cr2(SO4)3 is also produced. What is the molarity of the K2Cr2O7 solution?

0.0794 M

0.476 M

2.96 M

0.0952 M

0.0158 M
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Answer #1

answer : 0.0794 M

K2Cr2O7 + 3Na2SO3 + 4H2SO4 ----------------> Cr2(SO4)3 + 3Na2SO4 + K2SO4 + 4H2O

mass of Na2SO3 = 1.500 g

moles of Na2SO3 = 1.500 / 126.04 = 0.0119 mol

from the balanced equation :

1 mol K2Cr2O7   ---------------> 3 mol Na2SO3

     ??                      -------------> 0.0119 mol Na2SO3

moles of k2Cr2O7 = 0.0119 x 1 / 3 = 3.97 x 10^-3 mol

moles = Molarity x volume

3.97 x 10^-3 = Molarity x 0.050

Molarity of K2Cr2O7 = 0.0794 M

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