Dear all,I'de like to dilute ethanol 95° to ethanol 70° with water.I remember it existe a Gay-Lussac table to do this according to the density of each liquide but I cannot find it anymore.Could you please tell me how to proceed and/or give me an internet address or a book title to find this Gay-Lussac table.Thank you in advance, Show Dens -Dens- Hi! Den To my mind your question need not this table. As I understand you can simply dilute 95 ethanol with water ( density 1 g\ml). Your task is not to make ethanol solution with exact conc. Yuo only need to dilute solution with known conc or in your case degree ( another dimension) So weight your volume of 95 solution you get y gram of your solution then add 0.36y gram of water . If you can't weight (big volume) take this94% ethanol - 758,6 g\l96% - 769,3 g\lmake proportion and calculate 95% solution weight -circlepoint- V1 * M1 = V2 * M2V1 = volume of ethanol you want to getM1 = the concentration of ethanol you want to get, in this case is 70 %V2 = volume of your stock ethanol, in this case is 95% , which is needed to be dissolvedM2 = the concentration of your stock ethanol (95%)Example:You want to make 100 mL ethanol 70% from ethanol 95 %100 * 70 = a * 95a = 7000/95 = 73.684 Take 73.684 mL or 73.7 mL or 74 mL (the precision depends on the purpose) ethanol 95% and add distilled water until total volume = 100 mL -Miss L- or, the easiest way, take 70 ml of 95% and add water to 95 ml. -mdfenko- QUOTE (mdfenko @ Apr 4 2007, 10:18 AM) or, the easiest way, take 70 ml of 95% and add water to 95 ml. Strongly agree with mdfenko! Sometimes our brain overload and build complex scheme!Take it easy Dens! -circlepoint- i can remember when i was a newbie, my mentor asked me about the same question, yea i was thinking like mdfenko but, i also thinking may be my mentor asked me a more difficult question which answer is not so easy like this, so i was making complex the answer and then lastly he told me take it easy as circle point said here
-T. reesei-
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Before you get started: This recipe is calls for 100% ethyl alcohol to make an alcohol solution an alcohol concentration of 70%. If you didn't purchase Culinary Solvent for your disinfectant spray recipe, please check the ABV of your alcohol, and ensure you are reading the right recipe. Links to additional recipes, calling for other types and varieties of alcohols, at the bottom of this post. -Mr.Tincture Make Your Own 70% Alcohol Solution using 100% Ethyl Alcohol (200 Proof Ethanol)When it comes to the healthy and safety of your family, friends, and coworkers, only the very best will do. Not all disinfectants are created equal, and not all are safe to use across all applications and on all surface types including stone, glass, composite, and natural surfaces. When it comes to killing germs and viruses that make you sick, it is vital we do so using methods that are as safe and nontoxic to our environment as possible. The best, safest way to eliminate harmful toxic chemicals from your home, office, kitchen, workbench, or nursery while killing germs and viruses on your surfaces is to rely on 100% ethanol. Culinary Solvent is pure 100% ethanol, perfect for the safe disinfection of many popular surfaces throughout your home, office, work space, or common area. 70% Alcohol Solution Spray Recipe Using 100% Ethyl AlcoholYield: 10 fl oz Final Concentration After Mixing: 70% ABV Important Heads up! If you dilute too much you will spread germs not kill them. Measure your ingredients when making this recipe, the health of your loved ones could be counting on it! When in doubt toss it out. Read more: How to tell the ABV of your starting alcohol (isopropyl or ethanol). Ingredients: Step 1 - In a clean spray bottle, combine the ethyl alcohol with water. Mix well by shaking gently. Step 2 - Store the 70% alcohol solution solution in a spray bottle for convenient measured dispensing. Store bottle away from sources of heat, spark, or direct sunlight. Mixture does not expires, contents will kill germs and viruses so long as the ABV remains above 70%. Source. Congratulations! Does ethyl alcohol kill germs, viruses, and bacteria on surfaces?Answer: Yes, so long as the concentration and contact time minimum requirements are met. For a detailed answer with links to authoritative sources, visit Does Ethyl Alcohol Kill Germs, Viruses, and Bacteria? Alternative Homemade Disinfectant Spray RecipesAdditional ResourcesBack to All About Food Grade Ethanol - A Blog by Culinary Solvent
Hafsat A. 1 Expert Answer
Jesse E. answered • 01/18/20 Experienced tutor for TEAS, chemistry, and biology
It depends on concentration of ethanol you are using and what volume you are making. For the purpose of an example, I will assume a stock solution of 95% ethanol solution and you need 500 mL of the 75% Ethanol solution. We will use the following equation where C1 and C2 refer to the initial and final concentrations of the solutions, respectively, and V1 and V2 refer to the volumes of the solutions, respectively. C1V1 = C2V2 Substitute in what you know: C1 = 0.95 C2 = 0.75 V1 = x V2 = 500 mL The equation becomes: x = 0.75 x 500 = 394 mL 0.95 In this example, you would need to add 394 mL of the stock solution of 95% ethanol to 106 ml of water. Using the above equation and and whatever initial concentration of alcohol you have available will get you any volume you need. Hope this helps! |