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１前言酸碱滴定中，要用不含Ｎａ２ＣＯ３的ＮａＯＨ溶液作为标准溶液。在配合滴定法测定自来水中钙含量时，为了掩蔽其中的镁离子，也需要向水样中加入一定量的ＮａＯＨ溶液。滴定５０ｍｌ水样，一般需要加入２２ｍｏｌ·１－１ＮａＯＨ溶液１－２ｍｌ。由于ＮａＯＨ溶液用量
1 Preface acid-base titration, the use of non-Na2CO3 NaOH solution as a standard solution. In conjunction with the titration method for determination of calcium in tap water, in order to mask the magnesium ions, also need to add a certain amount of NaOH solution to the water sample. Titration 50ml water samples, generally need to add 22mol · 1-1NaOH solution 1-2ml. Due to the amount of NaOH solution