Calculate the mass of a hydrochloric acid solution with a mass fraction of hydrogen chloride of 20%

| September 11, 2021 | education

Calculate the mass of a hydrochloric acid solution with a mass fraction of hydrogen chloride of 20%, which is necessary for the complete neutralization of a calcium hydroxide solution weighing 145 grams and with a mass fraction of alkali of 0.075.

2HCl + Ca (OH) 2 = CaCl2 + 2H2O.
1) Find the mass of the solute calcium hydroxide: 0.075 * 145 = 10.9 g.
2) Molar mass of calcium hydroxide: 40 + 32 + 2 = 74.
3) Amount of calcium hydroxide substance: 10.9 / 74 = 0.15 mol.
4) According to the reaction equation, there are two moles of hydrochloric acid per mole of hydroxide. This means that the amount of hydrochloric acid substance is: 0.15 / 2 = 0.075 mol.
5) The mass of the dissolved substance of hydrochloric acid: 0.075 * 36.5 = 2.74 g.
6) The mass of the hydrochloric acid solution: 2.74 * 100/20 = 13.7 g – the answer.



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