# Mixed 70 g of a 30% Naoh solution and 30 g of a 5% solution of the same hydroxide.

January 19, 2021 | education

| **Mixed 70 g of a 30% Naoh solution and 30 g of a 5% solution of the same hydroxide. Calculate the mass fraction of Naoh in the resulting solution.**

The weight of the resulting solution will be equal to the sum of the masses of the two initial solutions.

M = 70 + 30 = 100 grams;

The mass of alkali in the first solution is 70 x 0.3 = 21 grams;

The mass of alkali in the second solution is 30 x 0.05 = 1.5 grams;

The mass of alkali in the resulting solution will be equal to 21 + 1.5 = 22.5 grams;

The alkali concentration in the new solution will be 22.5 / 100 = 0.225 = 22.5%;

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