A 300g, 30% (w/w) NaOH solution is mixed with 500g40% (w/w) NaOH solution. What is % (w/v) NaOH, If density of final solution is 2g/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 A72.5 30% (w/w) of 300g of NaOH = 300×30100 = 90g 40% (w/w) of 500g of NaOH = 500×40100 = 200g Total volume of solution =MassofsolutionDensityofsolution. = 8002=400mL %(w/v) volume of NaOH=90+200400×100=72.5