Commercially available absolute ethanol can generally only achieve 99.5% purity. In many reactions, higher purity anhydrous ethanol is required, and it is often necessary to prepare it yourself. Generally, 95.5% ethanol used in industry cannot directly produce absolute ethanol by distillation, because 95.5% ethanol and 4.5% water form a constant boiling point mixture. To remove the water, the first step is to add calcium oxide (quick lime) to boil and reflux, so that the water in the ethanol interacts with the quick lime to form calcium hydroxide, and then the absolute ethanol is distilled off. In this way, absolute ethanol is obtained with a purity of up to about 99.5%. Anhydrous ethanol of higher purity can be treated with metallic magnesium or metallic sodium.
|Density (20 centigrade)||0.789-0.791g/mL|
|Miscibility with water||Passes test|
|Acidity (as H+)||≤||0.04mmol/100g|
|Alkalinity (as OH-)||≤||0.01mmol/100g|
|Carbonyl compounds (as CO)||≤||0.003%|
|Readily carbonizable substance||Passes test|
To prepare 95% ethanol from absolute ethanol, you will need to dilute it by adding a calculated amount of distilled water. Here are the steps to follow:
1. Calculate the amount of distilled water needed to dilute the absolute ethanol:
95% ethanol = (volume of absolute ethanol)/(total volume) Therefore, volume of distilled water = total volume – volume of absolute ethanol Substituting the values, Volume of distilled water = (100ml – volume of absolute ethanol) * (0.95/0.05)
2. Add the calculated amount of distilled water to the absolute ethanol:
For example, if you have 50 ml of absolute ethanol, Volume of distilled water = (100ml – 50ml) * (0.95/0.05) = 950ml So, add 950 ml of distilled water to 50 ml of absolute ethanol to obtain 1 liter of 95% ethanol.
3. Mix well until the ethanol and distilled water are thoroughly blended.
Note: Always use distilled water to avoid any impurities that could affect the quality of the ethanol.
First of all, ethanol is an important organic solvent, widely used
in medicine, paint, sanitary products, cosmetics, oils and other fields.
Secondly, ethanol is an important basic chemical raw material, which is used for manufacturing acetaldehyde, ethylamine, ethyl acetate, acetic acid, etc., and derives many intermediates of medicine, dye, paint, perfume, synthetic rubber, detergent,
pesticide and other products.
Thirdly, 75% ethanol aqueous solution has strong bactericidal ability and is a commonly used disinfectant in medical treatment.Finally, similar to methanol, ethanol can be used as an energy source.
When handling absolute ethanol and preparing solutions, there are a few important considerations to keep in mind.
Since the density of alcohol changes with the concentration, it is suitable for preparation after weighing. Calculate the mass of 95% and 5% of the total.
Use the beaker to weigh the amount of absolute ethanol needed.
Then add the calculated amount of water to the graduated cylinder and stir a few times to get 95% alcohol.Pour 95ml of absolute ethanol and 5ml of water into the container to set 95% ethanol.
1. Anhydrous ethanol is very easy to absorb moisture from the air and can be miscible with water and various organic solvents 2113 such as chloroform and ether in any ratio.
2. Ethanol is an important organic solvent, which is widely used in various methods such as medicine, paint, hygiene products, cosmetics, oils, etc. 5261 accounts for about 410250% of the total ethanol consumption.
3. Commercially available absolute ethanol can generally only achieve 99.5% purity. In many reactions, higher purity absolute ethanol is required, and it is often necessary to prepare 1653 by yourself.
4. Absolute ethanol with higher purity can be treated with metallic magnesium or metallic sodium.
In recent years, the price of absolute ethanol has trended upwards due to increasing demand, as well as supply chain disruptions caused by the COVID-19 pandemic. In some regions, the price of absolute ethanol has doubled or even tripled. However, prices may vary depending on the quantity and supplier, so it’s best to shop around for the best deal.
In conclusion, 95 ethanol preparation involves diluting absolute ethanol with a calculated amount of distilled water. Proper handling and storage are crucial when working with ethanol, and the recent trend in pricing emphasizes the importance of finding affordable sources.
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