久置的苯甲醛易被氧化成苯甲酸，故需在反应之前蒸馏除去，否则会对实验产生

久置的苯甲醛易被氧化成苯甲酸，故需在反应之前蒸馏除去，否则会对实验产生影响，而且在将苯甲酸钠酸化成苯甲酸时需要加入足量的酸，不然产物会有苯甲酸钠剩余，导致产物质量偏多，对实验产生误差

結果 (中文) 2:

For a long time the benzaldehyde is easy to be oxidized to benzoic acid, is required prior to the reaction distillation to remove, or on experimental effects, but also in the sodium benzoate benzoic acid acidification to need to add enough acid, or product with sodium benzoate surplus, cause product quality slants much, on experimental error