It was known that mixing equal volume say for example 25 mL of ethanol and 25 mL water doesnot result in 50 mL final volume of the final mixture.
Suppose I'ld like to prepare 100 mL of 70% ethanol, So in this case upon adding 30 mL water to 70 mL ethanol results in less than 100 mL (say 98 mL) of final mixture, So should i consider this less than 100 volume (Say 98 mL) as final or should i add little more water untill my final mixture volume shows/reaches themark of 100 mL ?
You should add more water to bring the volume to 100 ml.
Another consideration is that the solution will be warmer after mixing because of the heat of dilution, which increases the volume slightly. If you want a very accurate percentage of the solution (70.0%), you should wait until it cools back down before bringing the volume to 100 ml. Also, if you need the concentration to be that accurate, you should use a volumetric flask.
Hello, the Volume Correction Factor (VCF), also known as Correction for the effect of Temperature on Liquid (CTL), is a standardized computed factor used to correct for the thermal expansion of fluids, primarily, liquid hydrocarbons at various temperatures and densities. If you mixing equal volume 25 mL of ethanol and 25 mL water at the same exact temperature, and after mixing if you adjust same temperature you will receive exact volume. All depends from temperature.
To dilute Ethanol, you can use the Gay-Lussac dilution table (see attached).
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