氢氧化钠滴定液配制与标定

Preparation and Standardization for Sodium Hydroxide Volumetric Solution (氢氧化钠滴定液配制与标定)
Author 作者：
Date
日期：AC Analyst/AC分析员
Approved by 批准人：
Date
日期：AC Director/ AC主管
Approved by 批准人:
Date
日期: EHS VP & QA Director/EHS
副总兼QA主管
Approved by 批准人：
Date
日期: 杨蕊，Executive VP/常务副总
经理
Change
修改内容：
Update the version/更新旧版本
Objective/Scales 目标/范围：Be applicable to preparation,standardization, and re-standardization for NaOH standard solution.
适用于氢氧化钠滴定液（0.5mol/L）的配制，标定与复标。

Definitions
术语定义：
N/A Applicable to
适用对象：
AC /分析化学部
Attachment 附件：A: Error Criteria for Standard Solution Standardization/滴定分析用标准溶液标定的误差要求
B: Logbook for Preparation and Standardization of NaOH Volumetric Solution /氢氧化钠滴定液配制和标化记录
Reference Standard 参考标准Procedure 程序：
Responsibility 执行人Step
步骤
Action
执行内容
Analyst 分析员1 Sample appropriate sodium hydroxide, add definite water, surge and
shake, until saturated solution is produced. Cool it, put it in a plastic bottle made of ethane, deposit it, make it clarify,
Preparation and Standardization for Sodium Hydroxide Volumetric Solution (氢氧化钠滴定液配制与标定)
Responsibility 执行人Step
步骤
Action
执行内容
取氢氧化钠适量，加水振摇使溶解成饱和溶液，冷却后臵乙烯塑料
瓶中，静臵，澄清后备用。

2 Get clear sodium hydroxide solution 26ml, add boiled water to 1000ml,
shake, to make symmetrical liquid.
取澄清的氢氧化钠26ml，加新沸过的冷水使成1000ml，摇匀。

3 Weigh 3g primary standard potassium hydrogen phthalate whicch had
been dry to constant weight at 105℃, weigh accurately to 0.0001g,
dissolve it with 80ml boiled water in a dry conical flask, Add 2 drops
phenolphthalein indicator, titrate until the solution turns to pink. Do a
blank titration at the same time.
取在105o C干燥至恒重的基准邻苯二甲酸氢钾约3g，称准至
0.0001g，溶于80ml新沸过的冷水中，加2滴酚酞指示剂，用配制
好的氢氧化钠溶液滴定至溶液呈粉红色，同时作空白试验。

4 According to the consume of sodium hydroxide solution and the amounts
of potassium hydrogen phthalate, calculate the concentration of
sodium hydroxide volumetric solution with the formula below:
根据氢氧化钠溶液的消耗量和邻苯二甲酸氢钾的取用量，用下式算
出氢氧化钠滴定溶液的浓度：
c (NaOH) = m/[(V1-V2) 0.2042]
In whitch c (NaOH) is the concentration of NaOH volumetric solution,
in (mol/l),m is the amounts of potassium hydrogen phthalate, in g,, V1 is
the wastage of NaOH solution, in ml, V2 is the wastage of NaOH solution
in blank test, in ml.
式中：c (NaOH) —氢氧化钠滴定液之量浓度，mol/L。

m —邻苯二甲酸氢钾之质量，g。

V1 —氢氧化钠溶液之用量，ml。

V2—空白试验氢氧化钠之用量，ml。

Preparation and Standardization for Sodium Hydroxide Volumetric Solution (氢氧化钠滴定液配制与标定)
Attachment/附件A AC-049001
Error Criteria for Standard Solution Standardization
滴定分析用标准溶液标定的误差要求
1．Standardization n≥3, RSD≤0.1％.
标定份数≥3份，相对标准偏差≤0.1％。

2．Re-standardization n ≥3, RSD≤0.1％.
复标份数≥3份，相对标准偏差≤0.1％。

3．Deviation between standardization and re-standardization should be ≤0.15％.
标定和复标二者的相对偏差≤0.15％。

4．Standardization result should be similar to nominal value (±5%).
滴定液浓度标定值应与名义值一致，若不一致时，其最大与最小标定值应在名义值的±5％之间。

Reference SOP NO.: AC-049.01
Preparation and Standardization for Sodium Hydroxide Volumetric Solution (氢氧化钠滴定液配制与标定)
Attachment/附件B AC-049002 Logbook for Preparation and Standardization of NaOH V olumetric Solution
氢氧化钠滴定液配制和标化记录
Name/名称：Concentrate/浓度：
Benchmark Reagent/基准试剂：Indicator/指示剂：。