**PHARMACEUTICAL CALCULATION | BANK OF QUESTIONS PST LEVEL 4**

What is the meaning of International Unit?

What is Imperial Unit?

What is Metric System?

What is Household unit of measure?

What is a density?

What is a specific gravity?

What is the formula for calculating the volume of specified liquid when you have specific gravity and its weight?

What is the formula for calculating the weight of specified liquid when you have specific gravity and its volume?

What is the percentage of zinc oxide in an ointment prepared by mixing 200 g of 10% ointment, 50 g of 20% ointment, and 100 g of 5% ointment?

A hospital pharmacist wants to use three lots of zinc ointment containing respectively, 50%, 20% and 5% of zinc ointment. In what proportion should they be mixed to prepare a 10% zinc oxide?

What is dilution of liquid?

What is concentration of liquid?

What is the volume of potassium permanganate 10%w/v needed to prepare 2000 mL of 1%w/v solution of potassium permanganate?

What volume of dextrose 5% w/v solution will be prepared from 500 mL of dextrose 25%w/v solution?

What are the common diluents used for diluting powders for injection?

The label amoxicillin oral suspension calls for the additional of water into a bottle (100 mL) with a 30 mL of a dry powder such that when mixed with water will produce a 250 mg / 5mL amoxicillin oral suspension.

How many milliliters of water were added?

How many milligram of amoxicillin are in the suspension?

Answers:

The following is the answer for the above question:

Volume of the dry amoxicillin powder is 30 mL

Then volume of water needed will be determined as follows

Total volume (100 mL) – volume of dry powder (30mL) = 70 mL **Answer**

Amount ofamoxicillin in the suspension:

Each 5 mL contains 250 mg of amoxicillin

100 mL will contain X mg of amoxicillin.

X mg = (100 mL×250 mg )/5 mL

X mg = 5000 mg of amoxicillin powder

What are different methods used in the determination of child dose?

What are the reasons for calculating child dose?

What are the two important factors to consider when determining doses for elderly patients

What is Heparin?

How do you calculate the dose of Heparin?

What is the meaning of percentage weight-in-volume?

What do you understand by the term sodium chloride 0.9%w/v (normal saline)?

What is the meaning of percentage volume-in-volume?

What do you understand by the term sodium chloride 0.5%v/v chloroform solution?

What is the meaning of mg%w/v?

What do you understand by 400mg%w/v dextrose solution?

What do you understand by the following : percentage strength w/w, %w/v, %v/v, ratio strength and parts per million.

What do you understand by the term “reducing and enlarging of formula?”

Write the formula for calculating factor

What do you understand by dilution in a reduced or enlarged formula?

What is dilution of solids and semisolids?

What is concentration if solids and semisolids?

How many grams of 20% benzocaine ointment and how many grams of ointment base (diluent) should be used in preparing 5 lb. of 2.5% benzocaine ointment?

What is aliquot?

What are the steps of weighing by aliquot method?

What are the steps of measuring volume by aliquot method?

What is a pharmaceutical calculations?

What is the importance of pharmaceutical calculations?

What is Arabic numerals?

What is Roman numerals?

What are the units of measure of volume?

What are instruments that are used to measure volume?

Convert the following into mL : 0.5L, 1L, 2.5L, 5L and 250ÂµL

What are the units of measure of weight?

Convert the following units of measure of weight into milligram; 250g, 0.003kg, 7.4 g, 10g , 188000Âµg and 100g

What is the unit of measure of length?

Convert the following units of measure of length into meter: 100mm, 360cm, 80km, 123500Âµm, 0.045hm and 250 dm

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