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mol nh3 = 0,1v1
mol hcl = 0,1v2
selanjutnya bisa pakai mula2, bereaksi, sisa (seperti pereaksi pembatas) hcl harus habis untuk membentuk penyangga.
tersisa nh3 = 0,1v1 - 0,1v2
terbentuk nh4+ = 0,1v2
kb = 10^-5
ph yg diharapkn = 9
poh = 5
[oh-] = 10^-5
masuk k rumus hidrolisis:
[oh-] = kb . mol nh3 / mol nh4
0,1v2 = 0,1v1 - 0,1v2
v1:v2 = 0,2:0,1 = 2:1