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甲酸由干结构上的特殊性，使得它既表现出羧酸的性质，又表现出醛的性质，但要做好甲酸的银镜反应较为困难，往往由于甲酸用量过多，或酸碱度不适
The specificity of formic acid from the dry structure makes it exhibit both the properties of carboxylic acids and the nature of aldehydes. However, the silver mirror reaction of formic acid is more difficult, often due to excess formic acid or unfavorable pH.