Massa CH3COONa (Mr = 82 ) yg harus dilarutkan dalam 100 ml larutan agar diperoleh larutan dengan pH = 9 , Ka CH3COOH = 10^-5 adalah.....
a. 8,20 gram
b.4,10 gram
c 2,05 gram
d 0,82 gram
e 0,41 gram
bantu pakai caranya yaaaaaaa
a. 8,20 gram
b.4,10 gram
c 2,05 gram
d 0,82 gram
e 0,41 gram
bantu pakai caranya yaaaaaaa
fatihahalhusna
![Diketahui:\\Mr\ CH_3COOH=82\\V=100\ mL\\K_a=10^{-5}\\pH=9\\Ditanya:\\a=---?\\=======================\\Jawab:\\\\pH=9\rightarrow pOH=5\rightarrow [OH^-]=10^{-5}\ M](https://tex.z-dn.net/?f=Diketahui%3A%5C%5CMr%5C+CH_3COOH%3D82%5C%5CV%3D100%5C+mL%5C%5CK_a%3D10%5E%7B-5%7D%5C%5CpH%3D9%5C%5CDitanya%3A%5C%5Ca%3D---%3F%5C%5C%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%3D%5C%5CJawab%3A%5C%5C%5C%5CpH%3D9%5Crightarrow+pOH%3D5%5Crightarrow+%5BOH%5E-%5D%3D10%5E%7B-5%7D%5C+M "Diketahui:\\Mr\ CH_3COOH=82\\V=100\ mL\\K_a=10^{-5}\\pH=9\\Ditanya:\\a=---?\\=======================\\Jawab:\\\\pH=9\rightarrow pOH=5\rightarrow [OH^-]=10^{-5}\ M")
![\displaystyle {[OH^-]}=\sqrt{\frac{K_w.[M]}{K_a}}\\\\10^{-5}=\sqrt{\frac{10^{-14}.[M]}{10^{-5}}}~~~Kuadratkan\\\\10^{-10}=10^{-9}M\\\\M=0,1\ mol/L](https://tex.z-dn.net/?f=%5Cdisplaystyle+%7B%5BOH%5E-%5D%7D%3D%5Csqrt%7B%5Cfrac%7BK_w.%5BM%5D%7D%7BK_a%7D%7D%5C%5C%5C%5C10%5E%7B-5%7D%3D%5Csqrt%7B%5Cfrac%7B10%5E%7B-14%7D.%5BM%5D%7D%7B10%5E%7B-5%7D%7D%7D%7E%7E%7EKuadratkan%5C%5C%5C%5C10%5E%7B-10%7D%3D10%5E%7B-9%7DM%5C%5C%5C%5CM%3D0%2C1%5C+mol%2FL "\displaystyle {[OH^-]}=\sqrt{\frac{K_w.[M]}{K_a}}\\\\10^{-5}=\sqrt{\frac{10^{-14}.[M]}{10^{-5}}}~~~Kuadratkan\\\\10^{-10}=10^{-9}M\\\\M=0,1\ mol/L")
17 votes
Thanks 39
amsap
katanya di kuadratkan koq hasilnya itu 10.^-9? itukan blum dikuadratin baru 10^-14/10^-5
fatihahalhusna
10^-14 /10^-5=10^-9 dikuadratkan berarti tanda akar hilang
ramonikayu
Kenapa yang ditanyakan a? Bukan m?
fajriakhla1
Kenapa harus dikuadratkan?
destifitriana1
Itu kan sama aja [OH-]^2 = kw[M]/ka
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