Question

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) 1.00 g of NaCl + 100g of water 

(b) 0.11g of NaCl + 100g of water 

(c) 0.0l g of NaCl + 99.99g of water 

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

Answer 1

(c) 0.0l g of NaCl + 99.99g of water 

Mass % = Mass of solute / Mass of solute + Mass of solvent ×100  

= 0.01/  0.01+ 99.99 ×100  

= 0.01/ 100 ×100  

= 0.01 g