结合右图的四瓶溶液示意图,回答问题: 盐酸             

 结合右图的四瓶溶液示意图,回答问题:

盐酸                         氯化钠                      氢氧化钠                        碳酸氢钠

盐酸氯化钠氢氧化钠碳酸氢钠

1)写出号瓶溶液中溶质的俗名

2)农业上可以用中的溶液来选种(填序号)

3)焙制糕点所用发酵粉的主要成分是(填化学式)

4三种溶液 PH 值由大到小的顺序是(填序号)

答案

答案: 1)火碱、烧碱、苛性钠

2

3NaHCO3

(4) ③②①

解析: 2)浓度大,质优的种子会沉,不好的种子漂浮。质优的种子含有的有机物多,质

量大。 4)盐酸是酸性溶液 PH 值最小,氯化钠是中性溶液,氢氧化钠是碱性溶液

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