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Question 1 of 3

Chloral Mixture BP 1988 contains 0.5 g of Chloral Hydrate in 5 ml of the mixture. What is the concentration % w/v of Chloral Hydrate?

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% w/v
The concentration of Chloral Hydrate is 10 % w/v.
EITHER
 % w/v = mass of solute x               100                     (g/100ml)
volume of product
% w/v Chloral Hydrate = 0.5 x 100      (g/100 ml)
5
% w/v Chloral Hydrate = 10

OR
 5 ml of mixture contains 0.5 g of Chloral Hydrate
         100 ml contains 100 x 0.5 g = 10 g of Chloral Hydrate
5
Thus, concentration of Mixture is 10 g/ 100 ml = 10 % w/v.

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Question 2 of 3

Compound Sodium Chloride Mouthwash BP 1988 contains 0.3 g of Sodium Chloride in 20 ml of the mouthwash. What is the concentration of Sodium Chloride in the mouthwash, expressed as % w/v?

Type in your answer and PRESS ENTER.
% w/v
The concentration of Sodium Chloride is 1.5 % w/v.
EITHER
 % w/v = mass of solute x               100                     (g/100ml)
volume of product
% w/v Sodium Chloride = 0.3 x 100      (g/100 ml)
20
% w/v Sodium Chloride = 1.5

OR
 20 ml of mixture contains 0.3 g of Sodium Chloride
         100 ml contains 100 x 0.3 g = 1.5 g of Sodium Chloride
20
Thus, concentration of Mixture is 1.5 g/ 100 ml = 1.5 % w/v

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Question 3 of 3

Paediatric Digoxin Oral Solution contains 0.0375 g Digoxin in 750 ml of solution. What is the concentration % w/v of Digoxin?

Type in your answer and PRESS ENTER.
% w/v
The concentration of Digoxin is 0.005 % w/v
EITHER
 % w/v = mass of solute x               100                     (g/100ml)
volume of product
% w/v Digoxin = 0.0375 x 100      (g/100 ml)
750
% w/v Digoxin = 0.005

OR
 750 ml of mixture contains 0.0375 g of Digoxin
         100 ml contains 100 x 0.0375 g = 10 g of Digoxin
750
Thus, concentration of Solution is 0.005 g/ 100 ml = 0.005 % w/v

No, that is not the correct answer.

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