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weight to volume (w/v)%
[mass(g)/volume(mL)] x 100%
volume to volume (v/v)%
[mL solute/mL solution] x 100
parts per million (ppm)
[solute (same unit, g, mg)/solution (same unit, g, mg)] x 10^6
Molarity (M)
moles solute/volume of solution (L)
Dilution
used to make less concentrated solutions from more concentrated solutions (M - molarity V - mL or L)
M1V1 = M2V2