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(CH3COO)2Ca ⇒ 2CH3COO- + Ca2+ ( Ka = 10^-5 )
0,2 0,4 0,2
OH- =
= 2 x 10^-5
pOH = 5-log 2
pH= 9 +log2
2
a. PbS ⇒ Pb2+ + S2-
s s s
Ksp = (Pb2+)(S2-)
7x10^-27 = s²
s = √(7x10^-27)
b. Ag2CO2 ⇒2Ag+ + CO2^2-
s 2s s
Ksp = (Ag+)²(CO2^-2)
8,2 x 10^-12 = (2s)²(s)
8,2 x 10^-12 = 4s3
s =
c.
Bi2S3 ⇒ 2Bi3+ + 3S2-
s 2s 3s
Ksp = (2s)²(3s)³
1,6 x 10^-72 = 108 s^5
s =
angka nya jelek kak, males ngehitung pake kalkulatornya. maaf ya.
3.
Ca(OH)2 0,2 M
M = gr/Mr 1000/V
0,2 = gr/74 1000/500
gr = 0,2 x 74 / 2 = 7,4 gram