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Help with Density/Concentration Questions! (1 Viewer)

policy

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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

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3.0mL of ethanol x 0.79 g/mL = 2.37 grams of ethanol.

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

(a) 2.37 g / 100mL of solution

(b) 2.37 g/ 100mL = 23.7 g / litre (divide answer (a) by 0.1)

(c) Based on 100 ml of solution, (2.37 g / 100 mls) * 100 = 2.37 % (w/v)
 

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