Pharm Calc D2L Quiz 5

The alligation _______method is used to determine the number of proportional parts of the various ingredients needed to make a specific target strength product.

alternate

The alligation ______ method is used to determine the final product strength after combining several different strengths together.

medial

 

When using an alligation method, if one of the ingredients is pure active (drug) then the concentration used in the calculation is ______ % percent.

100

When using an alligation method, if one of the ingredients is a diluent (contains no drug) then the concentration used in the calculation is ______ % percent.

0

What g mass (two decimal places) of 10 % w/w of hydrocortisone ointment is needed to be mixed with 35 g of 1.8 % w/w hydrocortisone ointment to make 2.6 % w/w hydrocortisone ointment? Don't include the units.

3.78

Calculate the percentage of alcohol (to the nearest tenth) in a lotion containing 2 liters of witch hazel (14% of alcohol), 1.0 liter of alcohol (95%), and enough boric acid solution to make 7 liters. 

17.6%

In what proportion (how many proportional parts of each) should (a) 5% and (b) 1% hydrocortisone ointments be mixed to prepare a 2.5% ointment?  Just give the numerical value of the respective parts of each as whole numbers only, fractional values will not be correct, do not include any units (that means do not include p or parts within the answer).

a) 3

b) 5

The solvent for the extraction of a vegetable drug is 70% alcohol.

In what proportion may 95%, 60%, and 50% alcohol (answers have the parts expressed in that order) be mixed to prepare a solvent of the desired concentration?

6:5:5

In what proportions may a manufacturing pharmacist mix 30%, 20%, 8%, and 5% zinc oxide ointments to produce 10% ointment? Report the parts in the same sequence as the enlisted concentrations. 

5:2:10:20  or 2:5:20:10 as there can be two possibilities while mixing the products

How many grams of ointment base need to be added to a 20% zinc oxide paste to prepare 50 g of a 10% paste? Don't include the units. 

25

A pharmacist has a prescription for a compounded 1% hydrocortisone cream. She will add 2.5% hydrocortisone cream to 112 g of 0.25% hydrocortisone cream to prepare the 1% cream. The 2.5% cream and 0.25% cream should be mixed in a ratio of 1 part 2.5% cream to how many parts of 0.25% cream? Report whole number with no units.

2

The pharmacist must prepare 60 g of a 40% ephedrine sulfate using the 60% and 20% products in stock. How many grams of the 60% and the 20% products are needed?

30 g of 60%, 30 g of 20%

The pharmacist is asked to prepare one liter of 10% sodium bicarbonate solution. She only has a 1% solution and a 20% solution in stock. How many milliliters of the 1% solution will be required to compound this prescription. Round off to a whole number. Don't include the units. 

526

Using 10 grams of a 15% boric acid ointment, the pharmacist will manufacture a 12% ointment. How many milligrams of ointment base are required? Report a whole number and don't include units. 

2500

How many grams of 2.5% hydrocortisone cream should be mixed with 56 g of 0.25% hydrocortisone cream to prepare a 1% cream? Round to whole number, don't include units.

28

What is the percentage strength of alcohol in a mixture of 400 mL of a solution containing 40% v/v alcohol, 500 mL of a second solution containing 21% v/v alcohol, and a sufficient quantity of a nonalcoholic third solution to make a total of 1000 mL (assuming no volume contraction on mixing)? Don't include the units. Report up to one decimal place.

26.5

How many grams, each of pure hydrocortisone powder and 2% cream be mixed  to make 98 g of 6% cream?

4 g of pure drug and 94 g of 2% cream