Question

What is the pH of 0.000134 M solution of HCI?

Answer 1

Answer: The pH of 0.000134 M solution of HCl is 3.873.

Explanation:

When HCl dissociates in water then it will give hydrogen and chlorine ions. The reaction will be as follows.

          $HCl \rightarrow H^{+} + Cl^{-}$

This means that 1 mole of HCl is giving 1 mole of hydrogen ions on dissociation.

Hence, pH of the given solution will be calculated as follows.

                pH = $-log [H^{+}]$

                      = $-log (0.000134)$

                      = 3.873

Thus, we can conclude that the pH of 0.000134 M solution of HCl is 3.873.

Answer 2

Answer: The pH will be 3.87

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration.

$pH=-\log [H^+]$

$HCl\rightarrow H^++Cl^{-}$

According to stoichiometry,

1 mole of $HCl$ gives 1 mole of $H^+$

Thus $0.000134$ moles of $HCl$ gives =$\frac{1}{1}\times 0.000134=0.0001342$ moles of $H^+$

Putting in the values:

$pH=-\log[0.000134]$

$pH=3.87$

Thus the pH will be 3.87