Help with Density/Concentration Questions! (1 Viewer)

[policy]

13.0mL of ethanol was dissolved in water and the solution
made to 100mL. The density of ethanol is 0.79 g/mL

Calculate the concentration of the solution in:

a) g/100mL of solution

b) g/L

c) %(w/v)

Thanks!

 

[dcosmo]

13.0mL of ethanol x 0.79 g/mL = 10.27 grams of ethanol.

The ethanol will be dissolved into the solution that's been made up to 100 mL.

(a) 10.27 g / 100mL of solution

(b) 10.27 g/ 100mL = 102.7 g / litre (divide answer (a) by 0.1)

(c) Based on 100 ml of solution, (10.27 g / 100 mls) * 100 = 10.27 % (w/v)