醋酸（CH3COOH）是一种弱酸，常见于家用醋中，而碳酸氢钠（NaHCO3）又称小苏打，是一种碱性化合物。
将这两种物质混合在一起时，醋酸会向碳酸氢钠捐献一个质子（H+）。这种质子转移反应会形成碳酸（H2CO3），碳酸不稳定，会迅速分解成二氧化碳（CO2）和水（H2O）。该方程式可分解为几个步骤：
步骤 1：CH3COOH + NaHCO3 → CH3COO-Na+ + H2CO3
步骤 2：H2CO3 → CO2 + H2O
总的来说： CH3COOH + NaHCO3 → CO2 + H2O + NaCH3COO
因此，总的来说，醋酸和碳酸氢钠混合后会产生二氧化碳气体，从而导致该反应中常见的起泡或气泡效果。其他产物是水和醋酸钠。

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