Answer
$pH = 1.171$
Work Step by Step
To calculate the hydronium ion concentration of a solution with 2 strong acids, we just need to sum their concentrations:
$[HCl] = 0.0450M$
$[HNO_3] = 0.0225M$
$0.0450M + 0.0225M = 0.0675M = Total[H_3O^+]$
- Calculate the pH:
$pH = -log[H_3O^+]$
$pH = -log( 0.0675)$
$pH = 1.171$
