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

September 26, 2021 | education

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

To determine the final concentration of sodium hydroxide after mixing two different solutions, use the formula.

W (in-va) = w1 • m1 + w2 • m2 / m1 + m2.

W (NaOH) = 30% • 70 g + 5% • 30 g / 70 g + 30 g = 22.5%.

The concentration of the final solution will become 22.5%, and the mass will be 100 g.

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