Predict the direction of the following equilibrium and the approximate value of Keq.
$C H_{3} COOH$ + $NaHC O_{3}$ $⇌$ $C H_{3} CO O^{-} N a^{+}$ + $H_{2} C O_{3}$ ( $p K_{a}$ : 4.76 and 6.35)

Question

Predict the direction of the following equilibrium and the approximate value of Keq. C H 3 ​ COOH + NaHC O 3 ​ ⇌ C H 3 ​ CO O − N a + + H 2 ​ C O 3 ​ ( p K a ​ : 4.76 and 6.35)

TestHub · Accepted Answer

The acid on the left is C H 3 ​ COOH ( p K a ​ 4.76) and the acid on the right is H 2 ​ C O 3 ​ ( p K a ​ 6.35, effective). The weaker acid is on the right, so the products are favoured - which is why acetic acid effervesces with bicarbonate. Keq ≈ 1 0 6 ⋅ 35 − 4 ⋅ 76 = 1 0 1 ⋅ 59 ⋅

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