Week 1-3 Metric System, Magnification, & Molarity

Prefix for 10^3

Kilo (k)

Prefix for 10^-2

Centi (c)

Prefix for 10^-3

Milli (m)

Prefix for 10^-6

Micro (µ)

Prefix for 10^-9

Nano (n)

Base unit for Mass

Grams (g)

Base unit for Volume

Liters (L)

Base unit for Length

Meters (m)

Base unit for Amount of Substance

Moles (mol)

Base unit for Concentration

Molarity (M)

Converting from smaller prefix to larger prefix

Move the decimal to the left

Converting from larger prefix to smaller prefix

Move the decimal to the right

Formula for Total Magnification of a microscope

Ocular Magnification x Objective Magnification = Total magnification

Formula for Unknown Field Diameter

(Known field diameter) x (initial mag) + (unknown field diameter) x (final mag)

Formula for Molarity (M)

M = moles / liters (mol/L)

Formula for Molecular Weight

MW = grams / moles (g/mol)

Formula to calculate Moles from Liters and Molarity

Liters x Molarity = Moles

Formula to calculate Grams needed for a solution

Grams = Liters x Molarity x Molecular Weight

Concentration formula

Concentration initial x volume initial = concentration final x volume final

In dilution calculations, what does C1 and V1 represent?

Stock solution (initial concentration and volume)

In dilution calculations, what does C2 and V2 represent?

Working solution (final concentration and volume)

Formula to calculate volume of solvent (H2O) needed for dilution

Solvent Volume = V2 - V1

Millimolar (mM) expressed in base units

mmol / L

Micromolar (uM) expressed in base units

umol / L

Critical step before calculating molarity or dilution equations

Ensure all unit prefixes match before solving

Prefixs from greatest to least

Kilo, base, centi, milli, micro, nano

What does mass measure in?

Grams (g)

What does volume measure in?

Liters (L)

What does length measure in?

Meters (m)

What does concentration measure in?

Molarity (Mol)