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1. nyari H+ dr Ca(CH3COO)2 = √ka.M
=√2.2.10pngkt-5.10pngkt-2
= 2. 10 pangkt -3,5
pH=-log H+
= 3,5-log 2
= 3,5-0,3= 2,2
2. nyari mol
n naoh= 0,6 mmol
n ch3cooh = 0,8
persamaan reaksi
NaOH + CH3COOH ----> NaCH3COO + H2O
mula2 0,6 0,8
reaksi -0,6 -0,8
sisa - 0,2 0,2
pp=0,2 (sifat asam), H+ = ka. b/g
= 10pngkt-5. 0,2/0,2
= 10pngkt -5
pH = 5
3. cari mol,, mol HCL= 5mmol, mol NH4OH= 5mmol
persamaan reaksi
HCl + NH4OH ----> NH4Cl + H2O
mula2 5 5
reaksi -5 -5
sisa - - +5
karena tidak bersisa maka pHnya netral (7)