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a= 1 (valensi asam)
NaOH --> Na+ + OH-
b= 1 (valensi basa)
M sebelum ditetesi HCl
M1 × V1 = M2 × V2
0,1 M × 20ml = M2 × (20+10)ml
Makhir= 2/ 30 = 0,067 M
V HCl
M1 × V1 × a = M2 × V2 × b
0,1 M × V1 × 1 = 0,067 M × 30ml × 1
V1= 20,1 ml
V campuran
30ml + 20,1 ml= 50,1 ml