【简答题】用0.1mol/L NaOH滴定0.1mol/L的盐酸,甲基橙和酚酞是否都可选用作指示剂?为什么。用0.01mol/L NaOH滴定0.01mol/L的盐酸,能用甲基橙(变色范围pH=3.1~4.4)作指示剂吗?为什么。能用酚酞(变色范围pH=8~10)作指示剂吗?为什么。如用0.1mol/LNaOH滴定0.1mol/L的乙酸(pK a =4.74),甲基橙和酚酞是否都可选?为什么。
【简答题】Rewrite each of the following sentences, using the words given in brackets. The shirts Jimmy's aunt made for him a few years ago are too small for him now. (outgrow)