Question

A teacher told three students A, B and C to prepare 25% solution (mass by volume) of KOH. Student A dissolved 25g of KOH in 100g of water. Student B dissolved 25g of KOH in 75g of water and student C dissolved 25g KOH in water and made the volume 100ml. Which of them has made required 25% solution and why?​

Answer 1

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A teacher told three students A, B and C to prepare 25% solution (mass by volume) of KOH.

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asked Nov 21, 2017 in Class IX Science by ashu Premium (930 points)

A teacher told three students A, B and C to prepare 25% solution (mass by volume) of KOH. Student A dissolved 25g of KOH in 100g of water, student B dissolved 25g of KOH in 100 ml of water and student C dissolved 25g KOH in water and made the volume 100 ml. Which one of them has made required 25% solution ? Give your answer with reason.

1 Answer

Student C 

Solution-25 gm of KOH in water and the volume of the solution is 100 ml. 

Mass by volume percentage of solution = 



Detailed Answer: 

Student C made the required 25% solution. 

25 gm of KOH in water and the volume of the solution is 100 ml. 

Mass by volume percentage of a solution = 

                             

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Answer 2

Answer:

Student C

Solution-25 gm of KOH in water and the volume of the solution is 100 ml.

Mass by volume percentage of solution

$\frac{mass \: of \: solute}{volume \: of \: solution} \times 100 =$

$\frac{25g}{100} \times 100 = 25\%$

$\frac{25g}{100} \times 100 = 25\%$

Student C made the required 25% solution.

25 gm of KOH in water and the volume of the solution is 100 ml.

Mass by volume percentage of a solution

$\frac{mass \: of \:solute}{volume \: of \: solution} \times 100</p><p></p><p>$