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gr = n x Ar
4,1 = n x 82
n = 4,1 / 82
n = 0,05
Maukkan ke rumus hidrolisis
[0H-] = √kw / ka . [G]
= √10pangkat-14 / 10pangkat-5. 0,05
= √5x10pangkat-11
= 7,07 x 10pangkat-6
pOH= 6-log 7,07
pH = 14 - (6-log 7,07)
= 8 + log 7,07
= 8 + 0,84 = 8,84 = 9
no 6 ⇒ A no 7⇒B