Question on: SS1 Chemistry - Solutions and Concentration
A pharmacist needs to prepare 500 mL of a 10% (w/v) solution of glucose. How much glucose should be dissolved in water to make the desired solution?
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A
0.5 g
B
10 g
C
50 g
D
100 g
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Correct Option: A
0.5 g
In a w/v (weight/volume) solution, the weight of the solute (glucose) is expressed in grams, and the volume of the solution is expressed in millilitres (mL).
Given:
Volume of the solution (V2) = 500 mL
Concentration of the solution (C2) = 10% (w/v)
Weight of the solute (glucose) = ?
To find the weight of glucose, we need to convert the percentage to a decimal. 10% = 10/100 = 0.1.
Weight of glucose = (Concentration × Volume) / 100
Weight of glucose = (0.1 × 500 mL) / 100
Weight of glucose = 0.5 g
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