How will the mass fraction of alkali in the solution change if 40 g of potassium hydroxide

| July 22, 2021 | education

How will the mass fraction of alkali in the solution change if 40 g of potassium hydroxide were added to 360 g of a 35% solution?

Potassium hydroxide: KOH.
1) Find the mass of the potassium hydroxide solute in the original solution. To do this, we multiply the mass fraction of the substance by the mass of the solution and divide by one hundred percent: 360 * 35/100 = 126g.
2) Find the mass of the solute after adding alkali. To do this, add the found mass of the solute and the mass of added alkali: 126 + 40 = 166g.
3) Find the mass of the solution after adding alkali: 360 + 40 = 400g.
4) Find the mass fraction of alkali in the resulting solution. For this, the mass of the solute is divided by the mass of the entire solution and multiplied by one hundred percent: 166/400 * 100 = 41.5% – the answer.



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