How many grams of water do you need to evaporate from 500 g of a 10% sodium hydroxide solution to increase its concentration by 1.5 times?

bystudin | May 28, 2020 | Education

ω = m (substance) / m (solution)
Find the mass of alkali
m = 500 * 0.1 = 50 g
ω = m (substance) / m (solution), let x be the mass of water that needs to be evaporated, then:
0.15 = 50 / (500 – x)
75 – 0.15x = 50
x = 167 g

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