Molecular calculations

Question 1

Define units of drug concentration commonly used in pharmacology
and medicine, such as mg, mL, μg, μL, or mol/L, mmol/L in standardised scientific format:

Answer 1

Mass based units:

• milligrams (mg): 1mg = 10 -3 g
• micrograms (μg): 1μg = 10 -6 g
• nanograms (ng) : 1ng = 10 -9g

Volume based units:
- Milliliters mL: 1ml = 10 -3L
- microliters μL: 1μL = 10 -6L

Molarity:

• Concentration in moles per liter (mol/L)
• Relates the number of moles of a substance to the volume of solution
• millimolar mmol/L: 1 mmol/L = 10 -3 mol/L
• micromolar μmol/L: 1 μmol/L = 10 -6 mol/L

Question 2

Describe formula for solving dilution problem:

Answer 2

C1 V1 = C2 V2

C1 - initial concentration (stock solution)

V1 - volume of stock solution required

C2 - final concentration after dilution

V2 - Final volume after dilution

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