Posted by **Jessica** on Tuesday, December 7, 2010 at 2:03pm.

Can you please tell me if these are right?

Determine the pH for the following solutions

A [OH-] = 1.0 X 10^-7 M

I got 7

B. [H3O+ = 4.2 X 10 ^-3M

I got 2.4

C. [H3O+]= 0.0001M

I got 4

D. [OH-] = 8.5 X10^-9M

I got 5.9

What are the [H3O+] and [OH-] for a solution with the following pH values?

a. 10.0

For [OH-] I got 1.0*10^-4. and [H3O+] a. 10.0 I get 1.0*10^-10

Thank you!

And could you please tell me how to figure this question out?

Solution X has a pH of 9.5 and solution Y has a pH of 7.5.

a. what solution is more acidic?

b. what is the [H3O+] in each?

c. what is the [OH-] in each?

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