Question

What is the percent by volume of a solution formed by mixing 25ml of isopropanolbwith 45ml water ?​

Answer 1

I assume that you mix the 25 mL alcohol with 45 mL water.

The answer depends on a big IF : IF the volumes are additive. Very often volumes of liquids are not additive

Total volume = 70 mL

isopropyl alcohol %(v/v) = 25mL/ 70 mL * 100 % = 35.7% v/v

The answer should have only 2 significant digits: 36%v/v

Answer 2

Hi mate

% V/V (percentage of volume per volume) =?

V1 (solute volume) = 25 mL

V (volume of the solution) = solute + solvent = 25 mL + 45 mL = 70 mL

We apply the data to the formula of volume percentage of the solute per volume of solution, we will have:

%v/v=v1/v *100

v/v= 25/70 *100

% v/v= 2500/70

Hope It's helpful for you

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