Intro Chemistry Homework Help - pH/H3O+ concentrations and formulas?

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WorkingMAMA

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I'm a single mom (trying to get a nursing degree) with a screaming seven month old, not some slacker high school kid. I have been working on my online homework the entire week, and I DESPERATELY need help with my last three questions.

Give the concentration of H3O+ in solutions with the following pH values:

pH = 5.93 [H3O+] = ?

pH = 2.67 [H3O+] = ?

pH = 9.21 [H3O+] = ?

And I would appreciate an explanation in addition to the answers. We have our exam next week. Thank you!!!
 
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