Question

An Erlenmeyer flask contains 25.00 mL of 0.10 M HCl. What is the pH of the solution?

Answer 1

Answer:

The pH of the solution is 1.

Explanation:

Concentration of HCl solution = 0.10 M

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

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

$[HCl]=[H^+]=0.10 M$

The pH of the solution is defined as negative logarithm of $H^+$ ions in the solution.Mathematically written as

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

$pH=-\log[0.10 M]=1$

The pH of the solution is 1.

Answer 2

C=0.10 mol/l

pH=-lg[H⁺]

HCl = H⁺ + Cl⁻

pH=-lgc

pH=-lg0.10=1.0

pH=1.0