Chapter 9: Calculations & Conversions Flashcards
True or False
A solution is a homogeneous mixture of 2 or more constituents
True
True or False
A simple way to convert from % to mg/mL is to move the decimal point two places to the right
False
Move the decimal one place to the right
1% = 10 mg/mL
True or False
A 1-molar solution of a compound contains the molecular weight (MW) in grams of that compound per liter of solution
True
True or False
Dose is a term meaning how much of a drug is given per unit of body weight
False
Dose= the amount of drug given at one time
Dosage= how much of a drug given per unit of body weight
True or False
When determining the route of administration, the abbreviation PO means to give by mouth or orally
True
True or False
The abbreviation SID means to give the drug to an animal 3 times a day
False
SID= once per day
Calculate the area of a cage that is 9 in wide x 10 in long
=9in X 10 in
=90 in^2
2.2 lb = _____ kg
2.2 lb = 1 kg
1 in = _____ cm
1 in = 2.54 cm
10 mL = _____ cc
10 mL = 10 cc
A male weight has the following weights over 5 weeks. Calculate the average weight for that time period 1- 250 g 2- 287 g 3- 313 g 4- 334 g 5- 352 g
250+287+313+334+352/5 = 307.2 g average weight
If a 9kg bag of feed costs $34, what is the cost per kg?
34/9 = 3.78/kg
A colony of 10 Guinea pigs is fed 35g of feed per animal per day. How many 10-lb bags of feed would you need each week?
(0.001kg/g and 2.2lb/kg)
10 X 35= 350g feed/day 350g X 7 days = 2450g/week 2450g X 0.001kg/g = 2.45kg/week 2.45 kg X 2.2 lb/kg = 5.39 lb/wk 5.39lb / 10lb bag = 0.54 bag/wk
A medication is written as: Keflex 1g PO BID. 500 mg capsules are available.
(1000mg/g)
1 g X 1000mg/g / 500 mg/cap = 2 caps
2 caps twice daily by mouth
A veterinarian writes an order for a 90g hamster to have 4 mg/kg of a liquid medication SQ. This medication comes in a concentration of 1.0 mg/mL. How many mL will you administer?
(0.001kg/g)
90g X 0.001g/kg = 0.09 kg body weight
- 09kg X 4mg/kg = 0.36mg
- 36mg / 1.0mg/mL = 0.36mL
You have a order to give 1.5mg/kg of dexmethosone sodium phosphate to a 53.5 lb dog. The drug in the vial has a concentration of 5mg/mL. How many mL of dexmethosone does the dog need?
(2.2lb/kg)
53.5lb / 2.2lb/kg = 24.32 kg body weight
24.32kg X 1.5mg/kg = 36mg
36mg / 5mg/mL = 7.2 mL
You want to draw into a syringe 75mg of a preparation which has a drug concentration of 25 mg/mL. What is the volume you need?
25mg/1mL = 75mg/x mL
25mg X x mL = 75mg X 1 mL
x mL = 75mg x 1 mL / 25 mg
x mL = 3 mL
How many milliliters of 5% solution thiamylal should be drawn up in a syringe for a 50lb dog if the dosage is 20mg/kg.
(2.2lb/kg)
50 lb / 2.2lb/kg = 22.7kg
22.7kg X 20mg/kg = 454mg
5% solution = 50mg/mL
454mg / 50mg/mL = 9mL
To reconstitute a 1000mg bottle of a freeze-dried drug to yield a 2% solution, what volume of diulent should you have ready for filling the bottle to its 2% mark?
2% = 20mg/mL
1000 mg / 20 mg = 50 mL
How many milliliters of a 100mg/mL solution of enrofloxacin should a 23.8lb mini pig receive if the dosage is 3.5 mg/kg?
(2.2lb/kg)
- 8lb / 2.2 kg = 10.8kg
- 8kg X 3.5mg/kg = 37.8mg
- 8mg / 100mg/mL = 0.37mL
Using the following information, how many grams of calcium chloride (CaCl2) would be needed to a L of a 2 molar solution?
Atomic weights : Ca 40.1 Cl 35.5
Ca: 40.1g X 1 atom = 40.1g in 1 mole
Cl: 35.5g X 2 atom = 71.0g in 1 mole
40.1g + 71g = 111.1g CaCl2 in 1 mole of 1 L of a 1M solution
111.1 X 2 = 222.2g CaCl2 in 2 moles in 1 L of a 2M solution
