300 gm, 30% (w/w) NaOH solution is mixed with 500 gm 40% (w/w) NaOH solution. What is % (w/v) NaOH if density of final solution is 2 gm/mL :-

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W 1 N a O H ​ W 2 N a O H ​ W t ( N a O H ) ​ W t ( S o l n ) ​ D V V W ​ ​ = 100 30 ​ × 300 = 90 g = 100 40 ​ × 500 = 200 g = 200 + 90 = 290 g = 300 + 500 = 800 g = 2 V 800 ​ = 400 m L = 400 290 ​ × 100 = 72.5% ​

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