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BÀI GIẢNG HÓA PHÂN TÍCH TS. GVC. HOÀNG THỊ HUỆ AN

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d) Chuẩn độ đơn baz yếu bằng acid mạnh :<br />

Chuẩn độ V 0<br />

mL đơn baz yếu NaA (C 0<br />

, K b<br />

) bằng HCl (C)<br />

NaA + HCl = HA + NaCl<br />

Mức độ định phân : F = CV / C 0<br />

V 0<br />

Công thức tính pH trong quá trình chuẩn độ :<br />

F = 0<br />

0 < F < 1<br />

F = 1<br />

F > 1<br />

[ H<br />

[<br />

0<br />

−<br />

OH ] = C .<br />

[ H<br />

+<br />

]<br />

[ H<br />

+<br />

=<br />

+<br />

]<br />

=<br />

K<br />

K<br />

H<br />

K<br />

a<br />

2 O<br />

b<br />

1<br />

F<br />

− F<br />

⎛ C<br />

⎜<br />

⎝ C<br />

0<br />

C0V0<br />

] = ( F −1)<br />

V + V<br />

0<br />

K b<br />

C<br />

+ C<br />

0<br />

⎞<br />

⎟<br />

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