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Q.

To make a saturated solution $36 g$ of sodium chloride is dissolved in $100 g$ of water at $293$ K. Which of the following is the concentration of the solution at this temperature?

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a

23.45 %

b

26.35 %

c

26.45 %

d

26.47 %

answer is D.

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Detailed Solution

The concentration of solution at this temperature is

26.47 % .

36 g

sodium chloride is dissolved in

100 g

of water. Sodium chloride is solute because it is in low quantity and water is solvent due to high quantity. It is an example of type w/w (mass by mass percentage) to calculate concentration of solution.
Now we calculate the ‘concentration (mass by mass percentage) of solution’
Mass of sodium chloride

= 36 g

Mass of solvent

= 100 g

Mass of total solution

= 100 + 36 = 136 g

Concentration of solution

= \frac{Mass of solute}{total mass} \times 100

\Rightarrow \frac{36}{136} \times 100

\Rightarrow 26.47 %

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