A.1                                                           B.2

C.3                                                           D.4

5. 已知 298K 时， Ag₂CrO₄ 的溶解度为 s ，则 Ag₂CrO₄ 的溶度积常数 Ksp 与溶解度 s 间的关系是 (          )

A.s³                                                          B.2s³

C.2s²                                                                                                                D.4s³

6. 用 HCl 溶液滴定某碱液，量取两份碱液。一份以甲基橙为指示剂，消耗 HCl 体积为 V₁ ，另一份以酚酞为指示剂，消耗 HCl 体积为 V₂ 。若 V₁=V₂ ，则该碱液为 (          )

A.Na₂CO₃                                                  B.NaHCO₃

C.NaOH                                                    D.NaOH+Na₂CO₃

7. 下列关于准确度与精密度的关系说法正确的是 (          )