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10mml 0,2V - -
10mml 10mml 10mml 10mml
_______________________________________________________ -
0 0,2V-10 10 10
karena larutan HCL hatus habis pada larutan buffer
ph = 9
poh = 14 - 9 = 5
OH- 10^5
OH- = kb × mol basa lemah / asam konjugasinya
10^5 = 10^5 × 0,2V - 10 / 10
10 = 0,2V - 10
20 = 0,2V
100ml = Volume NH4OH