Calculate the pH of a 0.1% hydrochloric acid solution with a density of 1.01 g / ml.

univerkov | December 8, 2020 | education

Take the mass of the solution 1000 g
m (HCl) 1000 * 0.0001 = 1 g
V (p-pa HCl) = 1000 g / 1.01 g / ml = 990.1 ml = 0.9901 L
n (HCl) = m (HCl) / M (HCl) = 1 g / 36.5 g / mol = 0.0274 mol
Cm = n (HCl) / V (p-pa HCl) = 0.0274 / 0.9901 = 0.0277 mol / L
pH (HCl) = – log (0.0277) = 1.56

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