Question

calculate the concerntration in m/v if a solution of 50ml alcohol (density 1.02g/ml) is present in 150 ml water

Answer 1

Answer:

%C = V1/(V1 + V2) x [100]

%C = 50 mL/(50 mL + 150 mL) x [100]

%C = 50/200 = 25% (aproximately and not accurate)

Explanation:

Lets have alcoho with density 0.79 g/mL

First acalculate % by mass; mass of alcohol = 0.79 x 50 = 39.5 g

%C = 39.5 / 150 g + 39.5 g (x 100)= 39.5/189.5 = 20.94 % by mass

We look up in the table and we get the respective density of the solution

D= 0.96742 g/mL

having the density of the solution

%C = m/DxV x (100]

We calculate the volumen of the solution

39.5 g = 0.2094 x 0.96742 x V

V = 194.99 mL

%V/V = 50 ml/194.99 / = 25.64 %

Answer 2

Answer:

25%

Explanation:

Volume of solute= 50ml

Volume of solvent= 150ml

∴ Total volume= 150+50=200ml

Concentration=

Volume of solution/

Volume of solute *100

50/200 *110 =25%