List the prefix, symbol, and decimal values of units in the metric system correct answers Milli (m): 0.001
Micro (μ): 0.000001
Nano (n): 0.
Pico (p): 0.000
Femto (f): 0.000000
Convert from one unit of the metric system to another correct answers Multiple, Mass, Volume
one, g, L
1/10, dL...
List the prefix, symbol, and decimal values of units in the metric system correct
answers Milli (m): 0.001
Micro (μ): 0.000001
Nano (n): 0.000000001
Pico (p): 0.000000000001
Femto (f): 0.000000000000001
Convert from one unit of the metric system to another correct answers Multiple, Mass,
Volume
one, g, L
1/10, dL
1/1,000, mg, mL
1/1,000,000, μg, μL
1/1,000,000,000, ng
1/1,000,000,000,000, pg
to convert "down" the table: multiply by the denominator
to convert "up" the table: divide by the denominator
Define and Calculate %w/v correct answers a solid solute mixed with a liquid solvent
1% = 1g/100mL
Define and Calculate %w/w correct answers solid solute weight/total weight
most accurate type of % concentration but not commonly used
%w/w = % solute weight/total weight of solution
Define and Calculate %v/v correct answers liquid solute in a liquid solvent
%v/v = %liquid solute/total solution volume
Convert concentration and volumes of solutions correct answers V1C1 = V2C2
Define and calculate the molarity of a solution correct answers 1 mole (GMW) = #
grams equal to the atomic/molecular weight of a substance
1M solution = 1 mole solute/L of solution
Molarity = (g/L)/GMW
Utilize weight and volume of a substance to prepare a solution of desired molarity
correct answers Example 1: Prepare 500mL of 2M NaCl (Na=23, Cl = 35.5)
◦ GMW = 23 + 35.5 = 58.5
◦ M = (g/L)/GMW
, ◦ 2M = (?/0.5)/58.5
◦ 2*58.5 = ?/0.5
◦ 2*58.5*0.5 = 58.5 g NaCl in 500 mL H2O
Example 2: What is the molarity of 25g of NaCl in 500mL of solution?
◦ GMW = 58.5
◦ M = (25/0.5)/58.5 = 0.85M
Define and calculate normality correct answers normality: amount of substance per liter
that can react with 1M of H+
normality = (g/L)/GEW
GEW = GMW/#valence electrons
Determine the amount of a substance needed to prepare a solution of a desired
normality correct answers Example: Make 400mL of a 0.5 N H2SO4 solution. (H=1,
S=32, O=16)
◦ N = (g/L)/GEW
◦ GMW = (2*1) + (32) + (16*4) = 98
◦ GEW = 49
◦ 0.5 = (?/0.4)/49
◦ (0.5*49) = ?/0.4
◦ (0.5*49)*0.4 = ?
◦ 9.8g H2SO4 diluted up to 400 mL
Convert between molarity and normality correct answers Molarity --> Normality: N = M
x Valence
Normality --> Molarity: M = N/Valence
Convert between mEq/L and mg/dL correct answers mEq/L --> mg/dL:
mEq/L = (mg/L)/GEW = (mg/dL*10)/GEW
mg/dL --> mEq/L:
mg/dL = (mEq/L*GEW)/10
Prepare an assigned dilution. Correct a laboratory result for dilution of the sample
correct answers dilution = solute/total volume
dilution factor utilized to obtain true value from dilution (denominator of dilution)
Calculate dilution folds and determine the tube dilution and substance (serum) dilution
of any given tube in a serial dilution correct answers final serum dilution = initial dilution
x dilution 1 x dilution 2 x etc.
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