Question

Calculate the concentration of a solution which contains 2.5 g of salt dissolved in 47.5 g of water.

Answer 1

Answer:

Amount of sugar=2.5g

Amount of water=47.5g

Total amount=47.5+2.5=50g

Percent by mass of sugar= 2.5÷50×100

=5℅

So the percent by mass of water =100-5=95℅

Percent of sugar=5℅and per. Of water=95℅

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Answer 2

given, the mass of solute (salt) = 2.5 g

and mass of solvent (water) = 50g

as we know that mass of solution = mass of solute + mass of solvent

= 2.5 + 50

= 52.5g

concentration of the solution = (mass of solute/mass of solution) × 100

= (2.5/52.5) × 100

= 250/52.5

= 4.76% (approximately)