Question

A sugar solution is obtained by dissolving 30 g of sugar in 70 g of water. What should be done to make the concentration of solution 25% ?

Answer 1

Answer:

Right now the concentration is

30/(70+30)

=30%

to make it 25%

or 30:(30*4)

or 30:120

we have to add

20g water

Answer 2

Given: A sugar solution is obtained by dissolving 30 g of sugar in 70 g of water.

To find: We have to find a way to make the concentration of solution 25%.

Solution:

To make a concentration of the sugar solution 25% we have to add xg of water to the solution.

Thus here sugar is the solute and water is the solvent.

Thus, the concentration of the sugar solution is given as-

$\frac{30}{100 + x} = \frac{25}{100} \\ \frac{6}{100 + x} = \frac{1}{20} \\ 120 = 100 + x \\ x = 20$

The value of x is 20.

Thus 20g water should be added to the sugar solution to make the concentration 25%.