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19. The teacher instructed three students ‘A’, ‘B’ and ‘C’ respectively to prepare a 50%. (mass by volume) solution of sodium hydroxide (NaOH). ‘A’ dissolved 50 g of NaOH in 100 ml of water, ‘B’ dissolved 50 g of NaOH in 100 g of water while ‘C’ dissolved 50 g of NaOH in water to make 100 ml of solution. Which one of them has made the desired solution and why?

19. The teacher instructed three students ‘A’, ‘B’ and ‘C’ respectively to prepare a 50%. (mass by volume) solution of sodium hydroxide (NaOH). ‘A’ dissolved 50 g of NaOH in 100 ml of water, ‘B’ dissolved 50 g of NaOH in 100 g of water while ‘C’ dissolved 50 g of NaOH in water to make 100 ml of solution. Which one of them has made the desired solution and why?

Grade:12th pass

1 Answers

Pawan Prajapati
askIITians Faculty 60796 Points
one year ago
‘C’ was right. The water changes its volume, when the NaOH is dissolved in it. So, the volume needs to be adjusted. Mass by volume (%) = Mass of solute # 100 Volume of solution = 50% mass by volume

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