prevous l 41 roblem 11.110 What is the OH in solution X

prevous l 41 roblem 11.110 What is the [OH in solution X? Express your answer to tone significant figure and include the appropriate units Solution X has a pH of 9.70, and solution Y has a pH of 7.8 Value M Submit My Answers Give Up Incorrect: Try Again; 4 attempts remaining Part E What is the [OH ] in solution Y? Express your answer to one significant figure and include the appropriate units. Value Units Submit My Answers Give Up Incorrect: Try Again; 6 attempts remaining

Solution

D)

we have below equation to be used:

pH = -log [H+]

9.7 = -log [H+]

log [H+] = -9.7

[H+] = 10^(-9.7)

[H+] = 1.995*10^-10 M

we have below equation to be used:

[OH-] = Kw/[H+]

Kw is dissociation constant of water whose value is 1.0*10^-14 at 25 oC

[OH-] = (1.0*10^-14)/[H+]

[OH-] = (1.0*10^-14)/(1.995*10^-10)

[OH-] = 5*10^-5 M

Answer: 5*10^-5 M

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