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29 Cards in this Set
- Front
- Back
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form. for Eq (with only one chloride)?
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add the molecular weights,
divide by 1 Used with salts |
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form. for Eq (with multiple chlorides)?
Aₓ Bₒ |
add the molecular weights,
multiply the molecular weight of the chloride by # of chlorides, divide by # of valence electrons (from "A" |
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form. for mEq (with multiple chlorides)?
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divide Eq by
1,000 |
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decimals...
if decimal moves 10 to the left.. |
divide (/) by 10
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decimals...
if decimal moves 10 to the left.. |
multiply (*) by 10
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Temperature
To convert Fahrenheit to Celsius |
º C = (º F - 32) x (5/9)
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Temperature
To convert Celsius to Fahrenheit |
º F = º C x (9/5) + 32
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"Clark's rule"
(one of the two other ways used to determine the dose of a child) (age 2- 12) |
…………………weight of the child
adult dose x –————————— …………………………150…………… = dose of the child |
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Young's Rule
(the other of the two other ways used to determine the dose of a child) (age 2- 12) |
age of the child (years)
—————————— x adult dose age of the child + 12 ……………………= child's dose |
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Basic way to calculate
the dose of a child |
• calculate adult dose
• divide by "conversion factor": (divide by 1.7) |
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In ratios of concentration (x:y), the number to the left of the column always means …
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--------Grams--------
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In ratios of concentration (x:y), the number to the right of the column always means …
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-------Milliliters--------
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Percentages of concentration (x%),
can be expressions of (expressed in) |
• weight per volume (g/100 ml)
• volume per volume (ml/100 ml) & • weight per weight percentage… (ie: gm/100 gm) |
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Converting between units of
measure |
……………………units of order
Units on hand x ———————— ……………………units on hand |
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Converting between units of
measure (plain version) |
………………………# of units desired
units that you have x ——————— ……………………units that you have |
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The most commonly encountered
ratios in terms of mg / ml 1:1,000, 1:100, 1:10 |
1:1,000 = 1 mg / ml
1:100 = 10 mg/ ml 1:10 = 100 mg/ ml |
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In order to calculate volume from a ratio with the mg strength given, convert to mg, then us order ÷ stock
method (or could use a : proportion) |
x mg
––––––––– = z ml dispensed y mg / ml |
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In order to calculate the dose received from a patient, for x ml of a
y: 1,000 solution, you convert the stock to mg / ml, then |
……… … y mg
(x ml) ––––––––– = z mg (reduced) ml (make sure that like units cancel) |
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…In order to "determine the percentage of a drug solution (x : y)
………(convert : to %) |
just convert : to parts/ 100
x g per 100 ml = x % ……… do conversion of mg / ml if not already expressed as x /100 ml |
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Ratio and Proportion Method
(where "#" = sig for "quantity") |
Total # in formula……# in formula
–––––––––––––– = ––––––––––––– Total # desired ………# desired |
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What is the general formula of the
Factor Method? …(when reducing, factor always < 1) …(when enlarging, factor always < 1) |
Total # Desired (New Total)
––––––––––––––––––––––––––––– Total # in Orig. Formula (Old Total) = factor (and then multiply by factor) |
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When compounding,
always look for three things: |
*Number of doses
*Total amount of drug *Size of dose |
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what is the formula for calculating the
# of doses? |
……………Total Amount
# Doses =–––––––––––––– ……………Size of Dose |
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what is the formula for calculating the
Total # in container? |
# doses x size of dose
=Total # in container |
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what is the formula for calculating the
size of the dose? |
……………………Total amount
Size of dose = ––––––––––––– ……………………..# of doses |
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Weight-in-weight(w/w) percentage
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parts of a drug in parts of a mixture by weight
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Percent weight-in-weight
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expresses the number of grams of a drug or active ingredient in
100 grams of a mixture (g/g). |
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Volume-in-volume(v/v) percentage
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parts by volume of the total mixture.
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Percentage volume in volume
usually used for mixtures of liquids in liquids. |
expresses the number of milliliters of a drug /active ingredient in 100 milliliters of a mixture
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