June 2019 1 28 Report
Perbandingan volume larutan HNO2 0,1 M dan KOH 0,1 M yanh dibutuhkan untuk membentuk larutan penyangga dengan pH = 4 (Ka HNO2 = 5x10^-4) adalah...

a. 1:3
b. 3:4
c. 4:3
d. 5:6
e. 6:5

tolong disertakan caranya yaa
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