Question

What quantity of water should be added to 3 litres of 10% solution of salt, so that it becomes 5% salt solution?

• A. 1.5 litres
• B. 2.7 litres
• C. 3 litres
• D. Cannot be determined
• E. None of these

Answer 1

The correct option is C 3 litres

The given solution has 10% salt, Water which is to be added has 0% salt concentration.

Final concentration of solution is 5%
Salt concentration:
So, water should be added to the given solution in the ratio 5:5 =1 : 1.
$\therefore$ Quantity of water to be added =$\frac{1}{1}\times 3=3litres.$