용액의 산도. pH, pOH 계산

용액의 산도. pH, pOH 계산

 

 

A solution has [OH-] = 2.8×10^-8 M.

a) Calculate pOH

b) Calculate [H+]

c) Calculate pH using a) and b) above

 

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a)

pOH = -log[OH-] = -log(2.8×10^-8) = 7.6

 

b)

[H+][OH-] = 10^-14

[H+] = (10^-14) / (2.8×10^-8) = 3.8×10^–7 M

 

c)

using a)

pH + pOH = 14

pH = 14 - pOH = 14 – 7.6 = 6.4

 

[참고]

pH = -log[H+] = 6.4

[H+] = 10^-6.4 = 4.0×10^–7 M

 

using b)

pH = -log[H+] = -log(3.8×10^–7) = 6.4