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Perubahan pH bila ditambahkan 10 ml HCl 0,1 M

1) Pada 200 ml CH3COOH 0,2 M dan 200 ml CH3COONa 0,2 M

HCl + CH3COONa → CH3COOH + NaCl
M 1 mmol 40 mmol 40 mmol

B -1 mmol -1 mmol +1 mmol

S - 39 mmol 41 mmol

[H+] = Ka x ([asam])/([garam])
[H+] = 10-5 x (41 mmol)/(39 mmol)
pH = 4,9782
Selisih dari pH awal = 5- 4,9782 = -0,0218

2)Pada 200 ml CH3COOH 0,5 M dan 200 ml CH3COONa 0,5 M

HCl +CH3COONa → CH3COOH + NaCl 10

M 1 mmol 100 mmol 100 mmol
B -1 mmol -1 mmol +1 mmol

S - 99 mmol 101 mmol

[H+] = Ka x ([asam])/([garam])

[H+] = 10-5 x (101 mmol)/(99 mmol)
pH = 4,9913
Selisih dari pH awal = 5- 4,9913 = -0,0087

3)Pada 200 ml CH3COOH 0,5 M dan 200 ml CH3COONa 0,5 M

HCl +CH3COONa → CH3COOH + NaCl

M 1 mmol 200 mmol 200 mmol
B -1 mmol -1 mmol +1 mmol

S - 199 mmol 201 mmol