CBSE Class 9 Answered
Cough syrup is common medicine used in cold and cough. It contains alcohol (ethanol) as one of its constituents. Some of the people use it as an alternative of wine.
(a) What should government do to prevent the misuse of such medicines?
(b) Which is the most common method for expressing the concentration of a solution?
(c) If 300 g of cough syrup contains 30 g glucose and 15 g alcohol, what is the concentration in the solution?
Asked by Topperlearning User | 03 Feb, 2015, 04:50: PM
Expert Answer
(a) Government should regulate production and supply of such medicines. There should be a proper law for sale and purchase of such medicines.
(b) The most common way of expressing the concentration of a solution is the 'percentage method'. It refers to the 'percentage of solute' present in the solution.
(c) Mass of glucose (solute) = 30 g
Mass of water and alcohol (solvent) = 300 - 30 = 270 g
So, Concentration = 30 / 270 x 100
= 11.11%
Answered by | 03 Feb, 2015, 06:50: PM
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