Question

What is the pH of a solution that contains 1.2 moles of nitric acid (HNO3) and 1.7 moles of hydrochloric acid (HCl) dissolved in 1000 liters of water?

Answer 1

 [H+]= 1.2 + 1.7/1000=0.0029 M
pH = - log 0.0029=2.54 

moles HCl = 0.0025 L x 6.0 M=0.015 
[H+]= 0.015/ 1.75=0.0086 M 
pH = 2.1  so the ph is 2.1 of given solution