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Questions and Answers
What is the final percentage of the mixture when 95 parts of a 4% solution and 50 parts of a 5% solution are combined?
In what proportion should 20% benzocaine ointment be mixed with an ointment base to produce a 2.5% benzocaine ointment?
Which of the following is the correct ratio for mixing zinc oxide ointments containing 50%, 20%, and 5% of zinc oxide to prepare a 10% zinc oxide ointment?
If you mix 5 parts of 50% zinc oxide ointment, 5 parts of 20% zinc oxide ointment, and 50 parts of 5% zinc oxide ointment, what is the final concentration of zinc oxide?
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When creating a 2.5% benzocaine ointment from 20% benzocaine ointment, what part of the mixture is base ointment?
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According to the alligation method, what is the total sum of parts when 95 parts of a 4% solution are mixed with 50 parts of a 5% solution?
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Study Notes
The Alligation Method
- The alligation method can be used to show the correct result.
- Example calculation: 95 x 4 = 380 and 50 x 5 = 250, with a total of 630, which equals 70% when divided by 9.
Benzocaine Ointment
- To produce a 2.5% benzocaine ointment, 20% benzocaine ointment should be mixed with an ointment base in a proportion of 2.5 parts of 20% ointment to 17.5 parts of ointment base.
- The relative amounts of the mixture are 25:17.5 or 1:1.7.
Zinc Oxide Ointment
- To prepare a 10% zinc oxide ointment, three lots of zinc oxide ointment containing 50%, 20%, and 5% zinc oxide should be mixed in a proportion of 1:1:10.
- The relative amounts of the mixture are 5 parts of 50% ointment, 5 parts of 20% ointment, and 50 parts of 5% ointment.
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Description
Solve pharmacy-related math problems using the alligation method, including mixing ointments to achieve specific concentrations.
