Where:
Parts of First Source =Required Concentration-Concentration of Second Source
and
Parts of Second Source= Concentration of First Source- Required Concentration
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Question 1 of 6
A solution is made from 200ml of 10% (w/v) Sodium Chloride solution, 350ml of 15% Sodium Chloride solution and 450ml of 25% Sodium Chloride solution. What is the concentration of the final solution? Answer to 1 decimal place.
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Question 2 of 6
A chemical comes as a stock solution containing 20% w/v of the chemical in water. How many millilitres of the solution do you need to prepare 1 litre of 15% solution?
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Question 3 of 6
An ointment contains 60g of Benzoic Acid in 1000g of ointment. How many grams of emulsifying ointment must be added to 300g of the ointment to reduce the concentration of Benzoic Acid to 4%?
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Question 4 of 6
What is the percent w/v concentration of Morphine Sulphate in the solution when 100ml of 0.1% w/v Morphine Sulphate solution, 25ml of 0.2% w/v Morphine Sulphate solution and 50ml of a 1 in 5000 solution of Morphine Sulphate are mixed. Answer to 3 decimal places.
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Question 5 of 6
How many grams of Coal Tar should you add to 550g of a Zinc Oxide paste in order to prepare a paste containing 12% w/w Coal Tar?
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Question 6 of 6
You need to prepare 220 ml of a solution containing 45% Sucrose. You have 10% and 65% Sucrose solution available. How many millilitres 65% Sucrose do you need?
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