论文部分内容阅读
一、选择题(只有一个选项符合题意) 1.将pH=5的稀硫酸溶液稀释500倍,稀 释后溶液中。(阳:一)与。(H‘)之比约为 () (A)l:l(B)l:2 (C)l‘10(D)10:l 2.把70%HNo3(密度为1 .409,cm一3) 加到等体积为30%HN仇(密度为1.209· cm一3)中,混合后硝酸溶液中溶质的质量分数 是() (A)50% (C
1. Multiple-choice questions (only one option meets the intended meaning) 1. Dilute the diluted sulfuric acid solution with pH=5 500 times and dilute the solution. (Yang: a) with. The ratio of (H’) is approximately () (A) l: l (B) l: 2 (C) l’10 (D) 10: l 2. Put 70% HNo3 (with a density of 1.409, cm - 3 ) Add to an equal volume of 30% HN (density: 1.209 cm-3). The mass fraction of solute in the nitric acid solution after mixing is () (A) 50% (C).