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The chromate ion present in water sample...

The chromate ion present in water sample is reduced to insoluble chromium hydroxide , `Cr(OH)_(3)` by dithionation, in basic solution .
`S_(2)O_(4)^(2-) + CrO_(4)^(2-) + 2H_(2)O to 2SO_(3)^(2-) + Cr(OH)_(3)+ OH^(-)`
100 L of water requires 387 g of `Na_(2)S_(2)O_(4)` . The molarity of `CrO_(4)^(2-)` in waste water is

A

0.0448

B

4.448

C

0.0148

D

0.0224

Text Solution

Verified by Experts

The correct Answer is:
C
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In a chrome plating plant, CrO_4^(2-) (chromate) ions are present in waste water. The chromate ions are reduced to insoluble chromium hydroxide, Cr(OH)_3 , by dithionate ion, S_2O_4^(2-) in basic medium. CrO_4^(2-)+S_2O_4^(2-)+overset(ɵ)(O)H+H_2OtoCr_2(OH_3)+SO_3^(2-) 10 L of water requires 522 g of Na_2S+2O_4 . Calculate the normality and molarity of CrO_4^(2-) in waste water. Also express the concentration of Na_2CrO_4 in ppm.

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