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What volume of 0.20 mol dm -3 NaOH solution would...

What volume of 0.20 mol dm -3 NaOH solution would yield 5.0 g of NaOH on evaporation to dryness? [NaOH = 40g mol-1]

A.

400 cm3

B.

625 cm3

C.

1000 cm3

D.

1600 cm 3

View answer & explanation

Correct answer is B

Conc. g/dm3 = 0.20 x 40 gmol -1 = 8 g/dm3
1000 cm3 of 0.20m NaOH contains 8g of NaOH :. 5g of NaOH will be contained in 5/8 x 1000 x 625cm3

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