Question

ram prepared two aqueous solutions of sugar i.e., 'A' and 'B'. he prepared 150 ml of solution 'A' with concentration 30% (w/V) and 200 ml of solution 'B' with concentration 40% (w/V). he mix solution 'A' and 'B'. identify the concentration (w/V) of solution formed after mixing.

Answer 1

20%(w/w)

∴ 20 grams solute in 100 grams of solution

∴ Let 25 grams of solute in x grams of solution

∴
25
20
​
=
x
100
​


∴ x=
20
100×25
​
=125 grams

∴ 25 grams of solute in 125 gram of solution

25%(w/v)

∴ 25 grams of solute in 100 ml of solution.

∴ 125 grams of solution has volume =100 ml

∴ density=
volume
mass
​
=
100
125
​
=