Transcript Dimensional Analysis #5
Chapter 5
Units
Measures the drug in terms of action
No symbol for units
Sample problems - Answers
Express the unit dosage in numerals and symbols: 1.
A.
Three hundred and fifty thousand units.
350,000 units 2.
A.
Twenty-five hundred units.
25,000 units 3.
A.
Sixty units.
60 units
Percentage (%) measures
Percentage means parts per hundred.
No space between the # and the % 1% not 1 %
The greater the percentage strength, the stronger the solution
or ointment.
Sample Question
Which is stronger, a 3% solution or a 6% solution?
A.
3% B.
6%
Which of the following is the correct abbreviation for “units”?
A.
Un B.
U C.
UN D.
Ut E.
None of the above
Percentage (%) measures
In solution, percent represents the number of grams of drug per 100 mL of solution.
100 mL of a 1% solution will contain 1 g of drug
Sample Questions
100 mL of a 1% solution will contain how many grams of drug?
1 g 100 mL of a 2.5% solution will contain how many grams of drug?
2.5 g 100 mL of a 10% solution will contain how many grams of drug?
10 g
100 mL of a 5% solution will contain how many grams of drug?
A.1 g B. 5 g C. 10 g D.100 g E. None of the above
But what if it is not 100 mL Mrs. Keele?
Convert % to fraction
To change percentage to fraction ÷ by 100 5% = 5 ÷ 100 = 0.05
What is the fraction of 7%
A.
70 B.
7 C.
0.7
D.
0.07
E.
0.007
What is the fraction of 60%
A.
60 B.
6 C.
0.6
D.
0.06
E.
None of the above
100 mL of a 5% solution will contain how many grams of drug?
100 𝑚𝐿 × 5% 5% = 5 ÷ 100 = 0.05
g/mL 100 × 0.05 = 5𝑔
250 mL of a 5% solution will contain how many grams of drug?
250𝑚𝐿 × 5% = 5% = 5 ÷ 100 = 0.05
g/mL 250 × 0.05 = 12.5𝑔
325 mL of a 6% solution will contain how many grams of drug?
A.18.5 g B. 6 g C. 16.25 g D.19.5 g E. None of the above
120 mL of a 5.4% solution will contain how many grams of drug?
A.
6.45 g B.
64.5 g C.
645 g D.
None of the above E.
I’m so lost I have no idea!
260 mL of a 3% solution will contain how many grams of drug?
A.
0.78 g B.
7.8 g C.
78 g D.
780 g E.
None of the above
Milliequivalent (mEq) measures
Number of grams of drug contained in 1 mL of a solution Who cares?
Not you What do I need to know -mEq = milliequivalent
Sample Questions: Express the milliequivalent dosages in numbers and symbols: 1.
Fifteen milliequivalents A.
15 mEq 2.
Twenty-five milliequivalents 3.
A.
25 mEq Forty-two milliequivalents A.
42 mEq
Ratio Measures
Parts of drug per parts of solution 1:500 1 part drug to 500 parts solution 1:20 1 part drug to 20 parts solution A solution that is 1 part drug and 10 parts solution is written: 1:10
If I take 1 bottle of alcohol & add it to 2 bottles of soda 1:2 ratio How drunk would one glass of this spiked punch make you?
If I take 1 bottle of alcohol & add it to 5 bottles of soda 1:5 ratio How drunk would one glass of this spiked punch make you?
Which would make you more drunk 1:2 or 1:5?
Ratio Measures
The less solution a drug is dissolved in, the stronger the solution.
A ratio of 1:2 is much stronger than 1:5 A ration of 1:5 is much stronger than a 1:500
Identify the strongest solution:
A) 1:20 B) 1:200 C) 1:2
Identify the strongest solution:
A) 1:50 B) 1:20 C) 1:100
Identify the strongest solution:
A) 1:1000 B) 1:4000 C) 1:3000
Household & Apothecary measures Ounce Abbreviation: oz
Household & Apothecary measures Ounce Metric equivalent: 30 mL 1 oz = 30 mL How many milliliters in 3 oz?
90 mL 30𝑚𝐿 1𝑜𝑧 × 3𝑜𝑧 = 90 mL
Household & Apothecary measures Tablespoon Abbreviation: T, TBS, Tbsp Metric equivalent: 15 mL 1 Tbsp. = 15 mL How many milliliters in 3 Tbsp?
45 mL (3 x 15 = 45) 15𝑚𝐿 1𝑇𝑏𝑠𝑝.
× 3𝑇𝑏𝑠𝑝
= 45mL
Household & Apothecary measures Teaspoon Abbreviation: t, TSP, tsp Metric equivalent: 5 mL So 1 tsp = 5 mL How many milliliters in 3 tsp?
15 mL (3 tsp x 5 mL = 15 mL)
Household & Apothecary measures Drop Abbreviation: gtt (gtts) Metric equivalent: 1 mL So 1 gtt = 1 mL How many milliliters in 3 gtts?
3 mL (3 x 1 = 3)
Household & Apothecary measures Grain Abbreviation: gr Metric equivalent: 60 mg 1 gr = 60 mg How many milligrams in 3 gr?
180 mg (3 x 60 = 180) (For grains see page 306 of your text book)
How many mL in 5 teaspoons?
A.
5 mL B.
10 mL C.
15 mL D.
25 mL E.
None of the above
How many mL in 25 drops?
A.
25 mL B.
50 mL C.
75 mL D.
100 mL E.
None of the above
The doctor says to give 2 oz, but you only have a mL cup. How much do you give in mL?
A.
2 mL B.
15 mL C.
30 mL D.
60 mL E.
None of the above
How many milligrams in 3 grains?
A.
50 mg B.
100 mg C.
150 mg D.
200 mg E.
None of the above
How many milliliters in 1 tablespoon?
A.
5 mL B.
10 mL C.
15 mL D.
25 mL E.
None of the above
True / False: A 40% solution is stronger than a 30% solution.
A.
True B.
False
True / False: A 5% ointment is stronger than a 2% ointment.
A.
True B.
False
True / False: 100mL of a 3% solution will contain 30 grams of drug.
A.
True B.
False
2.8 mL of a 5.7% solution will contain how many grams of drug? (Round to the nearest tenth) A.
B.
C.
D.
E.
2.8 g 5.7 g 0.1 g 0.2 g None of the above