近来有人问到，“一定浓度的碱性乙醇/甲醇怎么配制？一定浓度的氢氧化钾乙醇/甲醇溶液怎么配制？乙醇制氢氧化钾滴定液怎么配制？”其实，几个问题其实归结起来也就是一个问题“一定浓度乙醇制氢氧化钾滴定液怎么配制？”，弄清这点之后，类似碱醇溶液的配制方法便可轻松搞定。

Recently, someone has asked, "How to prepare a certain concentration of alkaline ethanol/methanol? How to prepare a certain concentration of potassium hydroxide ethanol/methanol solution? How to prepare a potassium hydroxide titration solution from ethanol?" In fact, several questions actually boil down to one question, "How to prepare a certain concentration of potassium hydroxide titration solution from ethanol?" After understanding this, a preparation method similar to alkaline alcohol solution can be easily solved.

现将乙醇制氢氧化钾滴定液(0.5mol/L或0.lmol/L)和甲醇制氢氧化钾滴定液(0.lmol/L)的配制和标定方法分享给大家，如下：

The preparation and calibration methods for ethanol to potassium hydroxide titrant (0.5mol/L or 0.1mol/L) and methanol to potassium hydroxide titrant (0.1mol/L) are now shared with everyone, as follows:

（一）

(1)

乙醇制氢氧化钾商定液(0.5mol/L或0.1mol/L)

Ethanol based potassium hydroxide solution (0.5mol/L or 0.1mol/L)

物料：

Material:

KOH分子量=56.11

KOH molecular weight=56.11

0.5mol/L:理论需要KOH28.06g,乙醇溶液标定到1000mL

0.5mol/L: Theoretically, KOH28.06g is required, and the ethanol solution is calibrated to 1000mL

0.1mol/L:理论需要KOH5.6l1g，乙醇溶液标定到1000mL

0.1mol/L: Theoretical requirement: KOH5.6l1g, calibrated to 1000mL with ethanol solution

配制：

Preparation:

乙醇制氢氧化钾滴定液(0.5mol/L):

Ethanol based potassium hydroxide titration solution (0.5mol/L):

取氢氧化钾35g;置锥形瓶中，加无醛乙醇适里使溶解并稀释1000mL,用橡皮塞密塞，静置24小时后，迅速倾取上清液，置具橡皮塞的棕色玻瓶中。

Take 35g of potassium hydroxide; Place in a conical flask, dissolve and dilute 1000mL with aldehyde-free ethanol, stopper with a rubber stopper, and let stand for 24 hours. Quickly pour out the supernatant and place it in a brown glass bottle with a rubber stopper.

乙醇制氫氧化钾滴定液(0.lmol/L):

Ethanol based potassium hydroxide titration solution (0. lmol/L):

取氢氧化钾7g，置锥形瓶中，加无醛乙醇适里使溶解并稀释成1000ml,用橡皮塞密塞，静置24小时后，迅速倾取上清液，置具橡皮塞的棕色玻瓶中。

Take 7g of potassium hydroxide and place it in a conical flask. Dissolve it in aldehyde-free ethanol and dilute it to 1000ml. Close it with a rubber stopper and let it stand for 24 hours. Quickly pour out the supernatant and place it in a brown glass bottle with a rubber stopper.

标定:

Calibration:

乙醇制氢氧化钾滴定液(0.5molL):

Ethanol based potassium hydroxide titration solution (0.5molL):

乙醇制氢氧化钾滴定液(0.5molL)精密量取盐酸滴定液(0.5mol/L)25ml，加水50ml稀释后，加酚酞指示液数滴，用本液滴定。根据本液的消耗里，算出本液的浓度，即得。

Ethanol based potassium hydroxide titration solution (0.5molL): Accurately measure 25ml of hydrochloric acid titration solution (0.5mol/L), dilute with 50ml of water, add a few drops of phenolphthalein indicator solution, and titrate with this solution. Calculate the concentration of this solution based on its consumption.

乙醇制氫氧化钾滴定液(0.lmolL):

Ethanol based potassium hydroxide titration solution (0. lmolL):

乙酵制氢氧化钾滴定(0lmolL)精密量取盐酸滴定液(0.lhmol/L)25ml;加水50ml稀释后，加酚酞指示液数滴，用本液滴定。根据本液的消耗量，算出本液的浓度，即得。

Titration of potassium hydroxide produced by ethylene fermentation (0lmol/L): Accurately measure 25ml of hydrochloric acid titration solution (0lmol/L); Dilute with 50ml of water, add a few drops of phenolphthalein indicator solution, and titrate with this solution. Calculate the concentration of this solution based on its consumption.

贮藏：

Storage:

置具橡皮塞的棕色玻瓶中，密闭保存。

Place in a brown glass bottle with a rubber stopper and store tightly.

（二）

(II)

甲醇制氢氧化钾商定液(0.moLL)

Methanol to potassium hydroxide agreed solution (0. molL)

物料：

Material:

KOH分子量=56.11

KOH molecular weight=56.11

0.1molL:理论需要KOH5.6llg，乙醇溶液标定到1000mL

0.1molL: Theoretically, KOH5.6llg is required, and the ethanol solution is calibrated to 1000mL

配制：

Preparation:

取氢氧化钾6.8g,加水4ml使溶解，加甲醇稀释成1000mL皮塞的棕色玻用橡皮塞密塞，静置24小时后，迅速倾取上清液，置具橡皮塞的棕色玻瓶中。

Take 6.8g of potassium hydroxide and dissolve it in 4ml of water. Dilute with methanol to 1000mL of brown glass stoppered with a rubber stopper. After standing for 24 hours, quickly pour out the supernatant and place it in a brown glass bottle with a rubber stopper.

标定:

Calibration:

同乙醇制氢氧化钾滴定液(0.5molL)的标定(通则8006)。

Calibration of potassium hydroxide titration solution (0.5molL) prepared from ethanol (General Rule 8006).

贮藏：

Storage:

置具橡皮塞的棕色玻瓶中，密闭保存。

Place in a brown glass bottle with a rubber stopper and store tightly.

从上表描述的配制过程来看，配制过程中，取用的氢氧化钾量较理论量略大，之所以这样做，是因为氢氧化钾本身在乙醇中的溶解度很大，但是氢氧化钾在空气中会吸收二氧化碳，而且氢氧化钾吸水能力也很强，再者配制好的碱醇溶液同样会吸收空气和溶液中的二氧化碳而消耗溶液中的碱。

From the preparation process described in the above table, it can be seen that the amount of potassium hydroxide used during the preparation process is slightly larger than the theoretical amount. The reason for doing so is because potassium hydroxide itself has a high solubility in ethanol. However, potassium hydroxide will absorb carbon dioxide in the air, and its water absorption ability is also strong. Additionally, the prepared alkali alcohol solution will also absorb carbon dioxide in the air and solution, consuming the alkali in the solution.

基于以上考虑，配制过程中应多称一些氢氧化钾才能达到需要的碱浓度，但是很难定向配制到具体的浓度，所以配制的碱醇溶液临用前应标定浓度，然后通过换算得到具体的碱浓度。更多相关事项就来我们网站http://qxu1539600089.my3w.com咨询！

Based on the above considerations, it is necessary to weigh more potassium hydroxide during the preparation process to achieve the required alkali concentration. However, it is difficult to directly prepare to a specific concentration. Therefore, the concentration of the prepared alkali alcohol solution should be calibrated before use, and then the specific alkali concentration should be obtained through conversion. For more related matters, come to our website http://qxu1539600089.my3w.com consulting service