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Question

A 300 g, 30% (w/w) NaOH solution is mixed with 500 g 40% (w/w) NaOH solution. What is % (w/v) NaOH, If density of final solution is 2 g/ml.

A
72.5
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B
65
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C
62.5
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D
None
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Solution

The correct option is A 72.5
30% (w/w) of 300 g of NaOH = 300×30100 = 90 g
40% (w/w) of 500 g of NaOH = 500×40100 = 200 g
Total volume of solution =Mass of solutionDensity of solution.
= 8002=400 mL
%(w/v) volume of NaOH=90+200400×100=72.5

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