Question

13.A solution is 4% NaOH by weight if we require 10g of NaOH, how much this solution by weight do we need?​

Answer 1

Answer:

250g

The molar mass of NaOH is 40g ( 23g(Na) + 16g(O) + 1g(h))

The solution is 4% NaOH by weight, so for every 40g NaOH (1 mol.) there is 1000g of the solution.

[4/100 = 40/x] {Let x be the mass of the solution}

[x = 1000]

10/40 = 1/4, so 10g = 1/4 mol. NaOH

1/1000 = (1/4)/y {Let y be the required mass of the solution}

1000/4 = y

y = 250g

Explanation:

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