若将50 g 18%的NaOH溶液和50 g 18%的盐酸混合,下列叙述正确的是( ) A.混

若将50 g 18%NaOH溶液和50 g 18%的盐酸混合,下列叙述正确的是(  )

A.混合溶液的pH=7

B.溶液混合前后的温度不变

C.混合溶液质量为100 g

D.混合溶液中生成物的溶质质量分数仍为18%

答案

C。由NaOH+HCl====NaCl+H2O知参加反应的NaOHHCl的质量比为4036.5,NaOHHCl等质量混合,HCl有剩余,混合溶液呈酸性,A;中和反应放出热量,导致液体温度升高,B;反应无气体、沉淀生成,故混合溶液的质量为100 g,C正确。反应后HCl剩余,溶液中的溶质为NaClHCl,两溶质的质量分数都不是18%,D错误。

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