Two litres of water evaporate from 10 litres | vedclass

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Question

(B)
1. Initial volume of solution $= 10$ litres.  
2. Concentration of salt $= 10\%$.  
3. Amount of salt $= 10\% 	ext{ of } 10 = 0.10 \

Vedclass · Accepted Answer

$12.5$

Vedclass · Answer

(B)
1. Initial volume of solution $= 10$ litres.  
2. Concentration of salt $= 10\%$.  
3. Amount of salt $= 10\% 	ext{ of } 10 = 0.10 	imes 10 = 1$ litre (or unit of mass).  
4. After evaporation of $2$ litres of water, the new volume of solution  
$= 10 - 2 = 8$ litres.  
5. The amount of salt remains constant at $1$ litre.  
6. New percentage of salt  
$= \left( \frac{	ext{Amount of salt}}{	ext{New volume of solution}} ight) 	imes 100$  
$= \left( \frac{1}{8} ight) 	imes 100 = 12.5\%$.

Two litres of water evaporate from $10$ litres of a solution containing $10 \%$ salt. The percentage of salt in the remaining solution is

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