200 g of water was dissolved in 20 g of potassium hydroxide. Calculate the mass fraction of potassium

univerkov | September 5, 2021 | education

200 g of water was dissolved in 20 g of potassium hydroxide. Calculate the mass fraction of potassium hydroxide in the resulting solution.

Given:
m (H2O) = 200 g
m (KOH) = 20 g

Find:
ω (KOH) -?

Solution:
1) m solution (KOH) = m (KOH) + m (H2O) = 20 + 200 = 220 g;
2) ω (KOH) = m (KOH) * 100% / m solution (KOH) = 20 * 100% / 220 = 9.09%.

Answer: Mass fraction of KOH is 9.09%.

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