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1. What is the hydroxide ion concentration and pH of a solution if the hydrogen ion concentration is 6.4 x 109 ? 2. What is t
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Answer #1

As we know, pH = -log[H+] ,

[H+][OH-] = 1.0×10-14

1.'[H+] = 6.4×10-9 M

[OH-] = 1.0×10-14/6.4×10-9

=> 1.6×10-6 M

pH = -log(6.4×10-9)

= 8.19

2) [OH-] = 4.2×10-11 M

[H+] = 1.0×10-14/4.2×10-11

=> 2.4×10-4 M

pH = -log(2.4×10-4)

= 3.62

3) pH = 5.4

[H+] = 10-5.4 => 4.0×10-6 M

[OH-] = 2.5×10-9 M

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