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ICSE Class 9 Chemistry Question 30 of 31

Water — Question 7

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Question 5

To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293 K. Find its concentration at this temperature.

Answer

Given,
Mass of solute = 36 g
Mass of solvent = 100 g
Mass of solution = Mass of solute + Mass of solvent
= 36 + 100
= 136 g

Mass percent = Mass of soluteMass of solution\dfrac{\text{Mass of solute}}{\text{Mass of solution}} x 100

= 36136\dfrac{36}{136} x 100

= 26.47%

∴ Concentration of sodium chloride in 100 g of water at 293k is 26.47%