“雪碧”是一种无色的碳酸饮料,将少量“雪碧”滴入紫色石蕊试液

雪碧是一种无色的碳酸饮料,将少量雪碧滴入紫色石蕊试液中,    然后再加热,溶液的颜色变化情况是:                                     

A.先变红后变紫               B.变红后颜色不再改变 

C.先变无色后变红             D.先变蓝后变紫

答案

A

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