Hydrogen-ion concentration questions?

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Posted on : 06-06-2014 | By : My Study Coach | In : Improve Your Concentration
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Please answer any or all and please show the steps so I understand. Thank you!
1) What is the pH if the hydrogen-ion concentration is 2×10^-1 M?
2) What is the hydrogen-ion concentration if the pH is 3.7?
3) What is the pOH if the hydrogen-ion concentration is 5.0×10^-7M?

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Comments (1)

1) What is the pH if the hydrogen-ion concentration is 2×10^-1 M?
pH = -log[H^+] = -log(2×10^-1) = 0.70

2) What is the hydrogen-ion concentration if the pH is 3.7?
[H^+] = 10^-pH = 10^-3.7 = 2.0 x 10^-4 M

3) What is the pOH if the hydrogen-ion concentration is 5.0×10^-7M?
First find pH: pH = -log(5.0×10^-7) = 6.3
Next use the equation: pH + pOH = 14
pOH = 14 – pH = 14 – 6.3 = 7.7

Hope this is helpful to you. JIL HIR

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