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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