Question

4. Calculate the concentration in % (v/v) of the following solution. a. 200 mL of solution contains 15 mL of alcohol b. 0. 100 L of 20.0% (v/v) ethylene glycerol solution. 5. Calculate the concentration in % (m/v) of the following solutions • 150 mL of solution contains 7.50 g of solid Na2SO4 • A 30.0 ml solution contains 0.38 g residue • 2000 mL of 1% (m/v) MgCl2 solution

Answer 1

% V/v = Volume of Solude - X100 Volume of solution t o Volume of solution z zoome Volume of solute (alcohol) = 15 me from 0 "% V/v = 15 me X100 doome = 7.5 % :: % VU = 7.5% Volume of solution = 0.1L = 0.1 x 10 ml = loome to v/v = 20% solute volume (ethylene glyce861)=3 substitute values in o 204 - volume of solute - 100 me X 100 Volure of Solute - loome 700 x 20 rolure of solute = come