Homework Help: Chemistry - pH

Posted by Mandy on Monday, September 14, 2009 at 10:12am.

Calculate the pH of each of the following solutions:

a) .35 M hydrochloric acid, HCl
b) .35 M acetic acid, HC2H3O2
c) .35 M sodium hydroxide, NaOH

Can someone please explain to me how to calculate the pH in a way that is easy to understand? I am confused. Could you please do one of the above questions as an example? Thank you so much!

Chemistry - pH - bobpursley, Monday, September 14, 2009 at 10:15am
This has a very good explaination. Go thru his examples, especially at the end.

On c, find the OH concentration, then the pOH, then you know pH+pOH=14 and you can solve for pH from that.
Chemistry - pH - GK, Monday, September 14, 2009 at 6:28pm
a) 0.35M HCl (monoprotic strong acid) produces a 0.35M [H+] solution.
pH = -log(0.35)

c) 0.35M NaOH (strong base) acid produces a 0.35M [OH-] solution.
pOH = -log(0.35)
pH = 14-pOH

b) 0.35M HC2H3O2 (WEAK ACID) does not dissociate completely. Its Ka = 1.8x10^-5
[H+] = sqrt[(Ka)(0.35)]
pH = -log[H+]

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