How many grams of caustic soda should be dissolved in 300 g of a 5% solution to obtain a 10% solution of NaOH

ω = m (substance) / m (solution)
Let it be necessary to add “x” g. Alkali, then
10 = (300 * 0.05 + x) * 100 / (300 + x)
x = 16.7 g.

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