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CVA Chemistry
Module 7
7.03 pH Math (Honors)
Review notes on Page 4 of this lesson:
pH = -log [H3O+]
[H3O+] × [OH-] = 1.0 × 10-14 M
[H3O+] = 10-pH
Using the math formulas above, calculate pH, [H3O+]
and [OH-]. Determine whether a solution is acidic, basic or neutral based on these values.
SHOW ALL YOUR WORK!!
1. Given pH = 8.55
Find: [H3O+] and [OH-]
Is this acidic, basic or neutral?
2. Given pH = 3.50
Find: [H3O+] and [OH-]
Is this acidic, basic or neutral?
3. Given [H3O+] = 3.67 x 10-8M
Find: [OH-] and pH
Is this acidic, basic or neutral?
4. Given [H3O+] = 9.89 x 10-3M
Find: [OH-] and pH
Is this acidic, basic or neutral?
5. Given [OH-] = 5.5 x 10-10M
Find: [H3O+] and pH
Is this acidic, basic or neutral?
6. Given [OH-] = 8.5 x 10-2M
Find: [H3O+] and pH
Is this acidic, basic or neutral?
7. Given [OH-] = 3.75 x 10-5M
Is this acidic, basic or neutral?
How do you know?
8. Given [H3O+] = 3.75 x 10-3M
Is this acidic, basic or neutral?
How do you know?
9. Given pH = 6.75,
Is this acidic, basic or neutral?
How do you know?
10. Given [H3O+] = 1.00 x 10-7M
Is this acidic, basic or neutral?
How do you know?
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