醋酸（CH3COOH）是一種弱酸，常見于家用醋中，而碳酸氫鈉（NaHCO3）又稱小蘇打，是一種堿性化合物。
將這兩種物質混合在一起時，醋酸會向碳酸氫鈉捐獻一個質子（H+）。這種質子轉移反應會形成碳酸（H2CO3），碳酸不穩定，會迅速分解成二氧化碳（CO2）和水（H2O）。該方程式可分解為幾個步驟：
步驟 1：CH3COOH + NaHCO3 → CH3COO-Na+ + H2CO3
步驟 2：H2CO3 → CO2 + H2O
總的來說： CH3COOH + NaHCO3 → CO2 + H2O + NaCH3COO
因此，總的來說，醋酸和碳酸氫鈉混合后會產生二氧化碳氣體，從而導致該反應中常見的起泡或氣泡效果。其他產物是水和。

擴展閱讀：

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Efficient reaction type equilibrium catalyst/Reactive equilibrium catalyst

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