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# Lab Math

### Lab math in the histology lab

Parts in 100 Percentage
Substance being dissolved Solute
The substance in which something is dissolved Solvent
Another way to write 10% 1:10 1/10 10/100
What type of glass ware should be used for measuring solutions Volumetric Glassware
Percent solution equation % desired:100=g or mL needed: volume desired
Method of compensating for variances in the actual dye content of dry dyes used in the preparation of staining solutions Gravimetric Factor
Gravimetric Factor Concentration of present dye/concentration of new dye=gravimetric factor
A 1M solution contains 1 gram molecular weight of a substance dissolved in enough water to give a final volume of 1 L.
A 1N solution 1 gram equivalent weight of solute per liter of solution
Molecular weight divided by the number of dissociable or replaceable hydrogen ions 1N solution
Equation to determine the weight of a substance needed for molar solutions weight in grams=MxVxFW M=desired Molarity V=desired Volume in Liters FW= Formula weight (molecular weight) including any water of hydration
Equation to determine the weight of a substance needed for normal solutions weight in grams= (NxVxFW)/ v N=desired Normality V=Desired volume in Liters FW= Formular weight (molecular weight) including any water of hydration v=positive valence, or number of dissociable or replaceable hydrogen ions
deci one-tenth part of
milli one-thousandth part of
centi one-hundreth part of
micro one-millionth part of (micron)
nano one-billionth part of
kilo one thousand times
Measure of length Meter
Measure of volume Liter
Measure of weight Gram
1 Liter= 1,000cc
1 lb 454 g
1 m 39.37 in
1in 2.54 cm
1 qt 0.95 L
Normal body temp (Celsius) 37 degrees Celsius
Conversion of Fahrenheit to Celsius degrees Celsius= ((degrees Fahrenheit-32)x5)/ 9
Conversion from Celsius to Fahrenheit degrees Fahrenheit= ((degrees Celsius x9)/5)+32
Strongly alkaline solutions should not be store in Glass
Strongly alkaline solutions should be stored in Polyethylene or polypropylene containers
Created by: Ziek98