Calculate [H^+] (express the result in molar units using three significant figur
ID: 1048608 • Letter: C
Question
Calculate [H^+] (express the result in molar units using three significant figures and scientific notation) [H^+] = Calculate [OH] (express the result in molar units using three significant figures and scientific notation) [OH^-] = Calculate [NH^+ _4] (express the result in molar units using three significant figures and scientific notation). [NH^+ _4] = Calculate [NH_3] (express the result in molar units using three significant figures and scientific notation). Calculate [NH_3] (express the result in molar units using three significant figures and scientific notation). [NH_3] = What is the pH solution? pH =Explanation / Answer
Pka = 9.24
Pkb = 14-Pka
= 14-9.24
= 4.76
-logKb = 4.76
Kb = 1.8*10-5
NH3 + H2O --------> NH4+ + OH_
I 0.01 0 0
C -x +x +x
E 0.01-x +x +x
Kb = [NH4+][OH-]/[NH3]
1.8*10-5 = x*x/0.01-x
1.8*10-5 *(0.01-x) = x2
x = 0.000415
[OH-] = x= 0.000415M
[NH4+] = x = 0.000415M
[NH3] = 0.01-x = 0.01-0.000415 = 0.009585M
[H+] = Kw/{OH-]
= 1*10-14/0.000415
= 2.41*10-11 M
POH = -log[OH-]
= -log0.000415 = 3.3819
PH = 14-POH
= 14-3.3819 = 10.6181
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