‘C’ has made the desired solution because 50% (mass by volume) solution means 50 g of solute dissolved in 100 mL of solution.
Mass by volume per cent = 𝑀𝑎𝑠𝑠 𝑜𝑓 𝑠𝑜𝑙𝑢𝑡𝑒/𝑉𝑜𝑙𝑢𝑚𝑒 𝑜𝑓 𝑠𝑜𝑙𝑢𝑡𝑖𝑜𝑛× 100
= 50/100×100
= 50% 𝑚𝑎𝑠𝑠 𝑏𝑦 𝑣𝑜𝑙𝑢𝑚𝑒.
Question
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 to make 100 mL of solution. Which one of them has made the desired solution and why?
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