Arun has prepared 0.01% (by mass) solution of Sodium Chloride in water. Which of the following correctly represents the composition of the solutions?
(a) 1.00g of NaCl + 100g of water
(b) 0.11g of NaCl + 100g of water
(c) 0.01g of NaCl + 99.99g of water
(d) 0.10g of NaCl + 99.90g of water

Correct Answer: (c) 0.01g of NaCl + 99.99g of water

Explanation: 

Mass% = (Mass of solute/ total mass of solvent) X 100

(a) 1.00g of NaCl + 100g of water

Mass% = (1/1+100)X100 = 0.99%

(b) 0.11g of NaCl + 100g of water

Mass% = (0.11/0.11+100)X100 = 0.1098%

(c) 0.01g of NaCl + 99.99g of water

Mass% = (0.01/0.01+99.99)X100 = 0.01%

(d) 0.10g of NaCl + 99.90g of water

Mass% = (0.10/0.10+99.90)X100 = 0.1%

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Updated on: 19-Jan-2023

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