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WorksheetsDilutions / Pengenceran
Total questions: 18
Worksheet time: 2hrs 30mins
If 400 mL of a 20% w/v solution were diluted to 2 liters, what would be the percentage strength (w/v)?
4% w/v
8% w/v
0,4% w/v
40% w/v
How many milliliters of a 1: 50 w/v boric acid solution can be prepared from 500 mL of a 5% w/v boric acid solution?
1250 mL boric acid solution
125 mL boric acid solution
50 mL boric acid solution
1,25 mL boric acid solution
If a pharmacist added 12 g of azelaic acid to 50 g of an ointment containing 15% azelaic acid, what would be the final concentration of azelaic acid in the ointment?
31,5% w/w
3,15% w/w
315% w/w
0,315% w/w
How many milliliters of water must be added to 250 mL of a 25% w/v stock solution of sodium chloride to prepare a 0.9% w/v sodium chloride solution?
6694,4 mL water
6944,4 mL water
669,44 mL water
66,944 mL water
How many milliliters of undecylenic acid would need to be added to 30 mL of a 20% undecylenic acid topical solution to change its concentration to 25%?
2 mL undecylenic acid
3 mL undecylenic acid
4 mL undecylenic acid
5 mL undecylenic acid
How many grams of zinc oxide should be added to 3400 g of a 10% zinc oxide ointment to prepare a product containing 15% of zinc oxide?
200 g zinc oxide
150 g zinc oxide
2200 g zinc oxide
240 g zinc oxide
How many grams of salicylic acid should be added to 75 g of a polyethylene glycol ointment to prepare an ointment containing 6% w/w of salicylic acid?
4,787 g salicylic acid
45 g salicylic acid
4,5 g salicylic acid
47,87 g salicylic acid
How many milliliters of water should be mixed with 1200 g of 65% w/w alcohol to make 45% w/w alcohol?
533 mL water
173 mL water
830 mL water
273 mL water
How many milliliters of a syrup containing 85% w/v of sucrose should be mixed with 150 mL of a syrup containing 60% w/v of sucrose to make a syrup containing 80% w/v of sucrose?
600 mL syrup
150 mL syrup
105 mL syrup
112 mL syrup
How many milliliters of a 0.2% solution of a skin-test antigen must be used to prepare 4 mL of a solution containing 0.04 mg/mL of the antigen?
0,08 mL antigen
0,8 mL antigen
8 mL antigen
80 mL antigen
How many milliliters of a 2% w/v solution of lidocaine hydrochloride should be used in preparing 500 mL of a solution containing 4 mg of lidocaine hydrochloride per milliliter of solution?
100 mL lidocaine hydrochloride injection
10 mL lidocaine hydrochloride injection
1 mL lidocaine hydrochloride injection
1000 mL lidocaine hydrochloride injection
If a pharmacist fortified 10 g of a 0.1% w/w tacrolimus (PROTOPIC) ointment by adding 12,5 g of an ointment containing 0,03% w/w of the same drug, what would be the percentage strength (w/w) of the mixture?
0,06% w/w
0,13% w/w
0,6% w/w
1,3% w/w
In using isoproterenol hydrochloride solution (1: 5000 w/v), 1 mL of the solution is diluted to 10 mL with sodium chloride injection before intravenous administration. What is the percentage concentration of the diluted solution?
0,002% w/v
0,02% w/v
0,2% w/v
0,0002% w/v
If equal portions of tretinoin gel (RETINA MICRO), 0,1% w/w and 0,04% w/w, are combined, what would be the resultant percentage strength?
0,07% w/w
0,7% w/w
1,4% w/w
0,14% w/w
In what proportion should 5% and 1% hydrocortisone ointments be mixed to prepare a 2,5% ointment?
3:5
5:3
1:5
5:1
In what proportion should 30% and 1.5% hydrogen peroxide solutions be mixed to prepare a 3% hydrogen peroxide solution?
1:18
18:1
1,5 : 30
30 : 1.5
If an antibiotic injection contains 5% w/v of the drug, how many milliliters of diluent should be added to 5 mL of the injection to prepare a concentration of 5 mg of the antibiotic per milliliter?
45 mL diluent
50 mL diluent
5 mL diluent
25 mL diluent
How many milliliters of a lotion base must be added to 30 mL of oxico- nazole nitrate (OXISTAT) lotion 1% w/v, to reduce its concentration to 6 mg/mL?
20 mL lotion base
30 mL lotion base
50 mL lotion base
6 mL lotion base
