Question

What is the pH of a solution that contains 25 grams of hydrochloric acid (hcl) dissolved in 1.5 liters of water?

Answer 1

First we calculate the concentration of HCl:

Moles = mass / Mr
= 25 / 36.5
= 0.685 mol

Concentration = 0.685/1.5 = 0.457 mol / dm³

For a strong monoprotic acid, the concentration of hydrogen ions is equal to the acid concentration.

pH = -log[H+]
pH = -log(0.457)
= 0.34

Answer 2

0.34 is the pH of a solution that contains 25 grams of hydrochloric acid dissolved in 1.5 liters of water.

What is pH?

Potential of hydrogen; a measure of the acidity or alkalinity of a solution equal to the common logarithm of the reciprocal of the concentration of hydrogen ions in moles per cubic decimetre of solution.

First, we calculate the concentration of HCl:

Given data:

Mass of HCl =25 grams

Molar mass = 36.5 g/mol

$Moles = \frac{mass}{molar \;mass}$

= $\frac{25}{36.5}$

= 0.685 mol

Concentration = $\frac{0.685}{1.5}$

= 0.457 mol / dm³

For a strong monoprotic acid, the concentration of hydrogen ions is equal to the acid concentration.

pH = -log[H+]

pH = -log(0.457)

= 0.34

0.34  is the pH of a solution that contains 25 grams of hydrochloric acid dissolved in 1.5 liters of water.

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