Question

Teacher instructed three students A , B and C respectively to prepare a 50%(mass by volume) solution of Sodium hydroxide(NaOH).Student A dissolved 50g of NaOH in 100ml of water, Student B dissolved 50g of NaOH in 100gm of water. Student C dissolved 50g of NaOH in water to make 100ml of solution. Which one of them has made the desired solution and why?​

Answer 1

Answer:

c is the right answer.

Explanation:

By definition, 50% mass by volume percent solution means 50 grams of a solute dissolved in 100 mL of solution. Therefore, student C made the desired solution. Student A dissolved 50 g of NaOH in 100 ml of water, So the solution is diluted and it is not a desired solution. By definition, 50% mass by mass percent solution means 50 grams of a solute dissolved in 100 grams of solution.

Student B dissolved 50 g of NaOH in 150 g of solution so, it is not the desired solution.

‘ C’ has made the desired solution by dissolving 50 g NaOH in water to make the volume of the solution 100 mL

Mass ok volume%= mass of solute/mass of solution both multiplied by 100

                          =50/100*100

                          =50%mass of volume

Answer 2

Answer:

Here is the answer.

Hope it helps you..