Please use the following values in your calculations:
Atomic weight(s): oxygen (O) = 16; carbon (C) = 12; hydrogen (H) = 1; iron (Fe) = 55.85; nitrogen (N) = 14, sodium (Na) = 23, magnesium (Mg) = 24; chloride (Cl) = 35.5, calcium (Ca) = 40, phosphorus (P) = 31, sulphur (S) = 32
1. Express the following to three significant figures – please answer a) to e). a. 16,628
Unless otherwise stated, please give your answer to TWO decimal places for the following questions;
2. Benzocaine ointment – please answer a), b) and c).
As a pharmacist, you receive the following prescription:
|[pic] | | |DOB: |Mr T. Hill | |11/11/65 |Upper street | | |Oldtown | | | | | | | | |Compound benzocaine ointment | | |Mitte: 37 g | | |Apply as directed to the affected area | | | | |Signature |A Doctor Date 12/01/2006 | | |The Medical Centre | | |Main Street | | |AL1 GU1 |
You obtain a formula from the Pharmaceutical Codex which states:
Hammamelis ointment450 g
Zinc ointment450 g
a) Amount of benzocaine (mg)
What is the amount of bezocaine in mg that you require to prepare the requested amount of compound benzocaine ointment? b) Percentage of hammamelis ointment (% w/w)
What is the percentage strength (% w/w) of hammamelis ointment in the compound benzocaine ointment? c) Amount of zinc ointment (g)
What is the amount of zinc ointment in grams that you require to prepare the requested amount of compound benzocaine ointment?
3. Number of parts (g) – please answer a) and b).
What quantity of (a) calamine and (b) yellow soft paraffin are needed to produce 660 g of the following product:
Calamine (parts weight)2
Yellow soft paraffin (parts weight)38
4. Volume of potassium chloride (mL)
You need to add 11 g of potassium chloride to a litre of sodium chloride 0.9 % infusion. You have 10 ml ampoules of 20 % w/v potassium chloride. What volume do you draw up from the potassium chloride ampoule?
5. Solubility (1 in X parts)
Express 60 mg in 60 mL as a 1 in … solution? State your answer to the nearest whole number.
6. Weight of ampicillin sodium (mg)
What weight (in mg) of ampicillin sodium (C16H18N3NaO4S) will provide 93 mg of ampicillin base (C16H19N3O4S)?
7. Weight of potassium...