1.

Arun has prepared 0.01% (by mass) solution of sodium chloride in water. Which of the following correctly represents the composition of thesolutions?

Answer»

1.00 g of NaCl + 100 g of water
0.11 g of NaCl + 100 g water
0.01 g of NaCl + 99.99 g of water
0.10 g of NaCl + 99.90 g of water

Solution :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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