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# Calculating pH of Solution

3 posts / 0 new Offline
Joined: Oct 2007
Calculating pH of Solution

I need assistance on a pH problem.

In this problem, I need to calculate the pH of a 8000 L solution containing 6.7 grams of HNO3 (nitric acid) and 4.5 grams of HCl (hydrochloric acid).

Any help would be appreciated. Offline
Joined: Jan 2007

first you need to find the moles of both the HCl and the HNO3. Since for every mole of HCl and HNO3 you produce one mole of H+ ions. The moles of HCl=H+ moles and the moles of HNO3=H+ moles. Then you need to add the moles of HCl and HNO3 together so that you get a total mole count. You do this because you have two sources of H+ ions and both acids will effect the pH. Take the total moles over the 8000L to get a molarity of H+ ions. Then take the negative log of the molarity and you will have your pH.

or

You can find the molarity of both the HCl and HNO3 and then add them together. Then you can take the negative log of that. Both methods work.

Philman G.:cool: Offline
Joined: Oct 2007

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