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一天，小影惊奇的发现妈妈蒸馒头时用的不是纯碱，而是小苏打，她好奇的问：“为什么不用纯碱而用小苏打？”妈妈说“面团没发酵，不能用纯碱”。通过查阅资料小影发现小苏打的化学式为NaHCO₃，是一种常用的膨松剂，加热可转化为纯碱。下列小影相关的推断不合理的是（ ）

A、小苏打是膨松剂是因为能产生二氧化碳气体

B、小苏打受热转化为纯碱是分解反应

C、小苏打属于酸

D、小苏打对人体无害