Homework Help: chemistry

Posted by kellin on Monday, May 14, 2012 at 12:41pm.

1. Find the pH of a solution whose [H3O+] is 9.5 X 10^ -8 M.

2. What is the [H3O+] concentration of a solution with a pH of 5.45?

3. What is the pOH of a solution with a [OH -] concentration of 2.97 X 10^ -10 M?

chemistry - DrBob222, Monday, May 14, 2012 at 2:25pm
1)
pH = -log(H^+)

2)
pH = -log(H^+)

3)
pOH = -log(OH^-)
chemistry - kellin, Monday, May 14, 2012 at 2:52pm
is this right?
-log(concentration of h3o+ or h+)
ph= -log(9.5*10^-8)
1) 7.022
chemistry - DrBob222, Monday, May 14, 2012 at 4:30pm
right. Very good. But I would round it to 7.02. You have two significant figures in 9.5E-8 so you are allowed just two in 7.02 (since it's a log the 7 doesn't count as a significant figures).

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