Question

What mass of 20% ethyl alcohol solution (mass/volume) of density 1.4 gram per cc is needed to prepare 200 ml solution of ethyl alcohol containing 20 gram per litre of solution?

Answer 1

Answer:

The concentration of a solution is often expressed as percent concentration by mass or percent by volume of solute in solution. Percent by mass is calculated from the mass of solute in a given mass of solution. A 5%-by-mass aqueous solution of sodium chloride contains 5 g sodium chloride and 95 g water in each 100 g solution.

Percent by mass = mass of solute

                                 ____________________

                                    mass of solution X 100%

If both solute and solvent are liquids, the concentration may be expressed as percent by volume. Both ethyl alcohol and water are liquids; the concentration of alcohol-water solutions is often given as percent by volume. For example, a 95% solution of ethyl alcohol contains 95 mL ethyl alcohol in each 100 mL solution.

Percent by volume = volume of solute

                                              _______________

                                               volume of solution X 100%

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