How to prepare and calibrate potassium hydroxide ethanol solution better than hydraulic oil
2018/5/15 Viewers:
The preparation and calibration of hydraulic oil potassium hydroxide ethanol solution are summarized as follows.
1. the preparation of potassium hydroxide ethanol liquid. In general, the preparation of potassium hydroxide and absolute alcohol solution (hereinafter referred to as alcohol lye) often occurs as follows: the yellowing of alcohol lye is caused by aldehydes in anhydrous alcohol. Alcohol lye is muddy because potassium hydroxide has strong hygroscopicity, some packaging is not strict or placed too long, and even has become lump, it is best not to use. If you can weigh more, use only the upper layer of clear liquid when preparing, and the bottom sediment will not be used. Alcohol alkaline solution has transparent white precipitation around the wall of the bottle, which is because the potassium hydroxide solution is very easy to absorb carbon dioxide in the air to produce potassium carbonate precipitation, it can be dissolved in water, but never add water. Because the presence of water in the alcohol solution will make the acid value titrant become muddy, making the endpoint not easy to judge. The way to prevent it is to make the alcohol lye contact with the air less. Once it is used up immediately, the liquid bottle should be filled with small space as much as possible.
2. in order to prevent alcohol lye from becoming muddy or precipitating, the following two methods can be used. First with the dilution method, then quickly called potassium hydroxide 7G. in the 20~30ml fine mouth bottle, immediately adding no aldehyde anhydrous ethanol to the bottle full, and then shaking for a few minutes, to most radon potassium oxide dissolved, after one night, the next day gently pumping about half of the upper level liquid, pour the 1000ml capacity bottle, and add no aldehyde anhydrous B. The alcohol can be calibrated, and it can be calibrated by potassium hydrogen phthalate two. The concentration of the solution is about 0.05M. If its dependency is less than 0.05M and greater than 0.04M, it can be used. If the solution is less than 0.04M, add more concentrated lye and then re calibrate its dependence.
3. if the concentration of alcohol lye is greater than 0.05M, additional absolute ethanol should be added. It can be made up more: the calculation of the dosage can be calculated according to the required quantity of potassium hydroxide (g) and the volume and Moore concentration required to prepare the alcohol alkali solution. It is not easy to open the bottle at the end of the bottle. It is advisable to use the upper layer of liquid when necessary, and can be used after calibration. The actual situation shows that the concentration changes little. The calibration of potassium hydroxide ethanol solution can be calibrated according to the following methods. The potassium hydroxide (Reference Reagent) 5.10548 (reference weight 0.0002g), which passes through 110C to dry 1H, is used to dissolve two distilled water after boiling and cooled by new heating and dissolved in the bottle of 500ml capacity, and the water is diluted to the scale and shake well. The theoretical value of the concentration of the liquid is 0.05M.
1. the preparation of potassium hydroxide ethanol liquid. In general, the preparation of potassium hydroxide and absolute alcohol solution (hereinafter referred to as alcohol lye) often occurs as follows: the yellowing of alcohol lye is caused by aldehydes in anhydrous alcohol. Alcohol lye is muddy because potassium hydroxide has strong hygroscopicity, some packaging is not strict or placed too long, and even has become lump, it is best not to use. If you can weigh more, use only the upper layer of clear liquid when preparing, and the bottom sediment will not be used. Alcohol alkaline solution has transparent white precipitation around the wall of the bottle, which is because the potassium hydroxide solution is very easy to absorb carbon dioxide in the air to produce potassium carbonate precipitation, it can be dissolved in water, but never add water. Because the presence of water in the alcohol solution will make the acid value titrant become muddy, making the endpoint not easy to judge. The way to prevent it is to make the alcohol lye contact with the air less. Once it is used up immediately, the liquid bottle should be filled with small space as much as possible.
2. in order to prevent alcohol lye from becoming muddy or precipitating, the following two methods can be used. First with the dilution method, then quickly called potassium hydroxide 7G. in the 20~30ml fine mouth bottle, immediately adding no aldehyde anhydrous ethanol to the bottle full, and then shaking for a few minutes, to most radon potassium oxide dissolved, after one night, the next day gently pumping about half of the upper level liquid, pour the 1000ml capacity bottle, and add no aldehyde anhydrous B. The alcohol can be calibrated, and it can be calibrated by potassium hydrogen phthalate two. The concentration of the solution is about 0.05M. If its dependency is less than 0.05M and greater than 0.04M, it can be used. If the solution is less than 0.04M, add more concentrated lye and then re calibrate its dependence.
3. if the concentration of alcohol lye is greater than 0.05M, additional absolute ethanol should be added. It can be made up more: the calculation of the dosage can be calculated according to the required quantity of potassium hydroxide (g) and the volume and Moore concentration required to prepare the alcohol alkali solution. It is not easy to open the bottle at the end of the bottle. It is advisable to use the upper layer of liquid when necessary, and can be used after calibration. The actual situation shows that the concentration changes little. The calibration of potassium hydroxide ethanol solution can be calibrated according to the following methods. The potassium hydroxide (Reference Reagent) 5.10548 (reference weight 0.0002g), which passes through 110C to dry 1H, is used to dissolve two distilled water after boiling and cooled by new heating and dissolved in the bottle of 500ml capacity, and the water is diluted to the scale and shake well. The theoretical value of the concentration of the liquid is 0.05M.
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