Arun has prepared 0301% (by mass) solution of sodium chloride in water. Which of the following correctly represents the composition of the solution ? (a) 1.00 g of NaCl + 100 g of water (b) 0.11 g of NaCl + 100 g of water (c ) 0.01 g of Nacl + 99.99 g of water (d) 0.10 g of NaCl + 99.90 g of water.

Arun has prepared 0301% (by mass) solution of sodium chloride in water

1.	Arun has prepared 0301% (by mass) solution of sodium chloride in water. Which of the following correctly represents the composition of the solution ? (a) 1.00 g of NaCl + 100 g of water (b) 0.11 g of NaCl + 100 g of water (c ) 0.01 g of Nacl + 99.99 g of water (d) 0.10 g of NaCl + 99.90 g of water.
Answer» By definition 0.01% (by mass) solution means that 0.01 g of sodium chloride is dissolved in 0.99 g (by mass) of water. Therefore (c ) represents the correct composition of the solution. This can be further verified as follows : Mass percent = `("Mass of sodium chloride")/("Mass of solution")xx 100` `=((0.01g))/((0.99 + 0.01))xx 100 =0.01%`

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Arun has prepared 0301% (by mass) solution of sodium chloride in water. Which of the following correctly represents the composition of the solution ? (a) 1.00 g of NaCl + 100 g of water (b) 0.11 g of NaCl + 100 g of water (c ) 0.01 g of Nacl + 99.99 g of water (d) 0.10 g of NaCl + 99.90 g of water.

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