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Units of Concentration

Units of Concentration. The analytical chemist’s nightmare!. SI Units. Concentration Units. Prefixes. Calculations. The Mole Concept The amount of substance which contains as many entities as there are atoms in 12 grams of 12 C. One Mole = 6.023 x 10 23 Avogadro’s Number. Calculations.

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Units of Concentration

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  1. Units of Concentration The analytical chemist’s nightmare!

  2. SI Units

  3. Concentration Units

  4. Prefixes

  5. Calculations • The Mole Concept • The amount of substance which contains as many entities as there are atoms in 12 grams of 12C. • One Mole = 6.023 x 1023 • Avogadro’s Number

  6. Calculations • Molar Solutions • xM = mass/RMM in 1000ml

  7. Calculations • Molar Solutions to gdm-3 • mass = xM x RMM in 1000ml

  8. Calculations • Molar Solutions to ppm • 1ppm = 1mg per kg • mass = xM x RMM in 1000ml • mass (g) x 1000 = mass (mg)

  9. Mass of Solute Total Mass of Solution %(w/w) = x 100 Volume of Solute Total Volume of Solution %(v/v) = x 100 Mass of Solute 100ml of Solution %(w/v) = x 100 Calculations • Percentage Concentrations

  10. Calculations • 10% Ethanol in Water • 10% (w/v) = 10g per 100ml = 100g in 1000ml • 100g / 46.07 = 2.17M • 10% (v/v) =10ml per 100ml = 100ml in 1000ml • 100ml x 0.79 = 79g 79g / 46.07 = 1.71M • 10% (w/w) = 10g per 100g = 100g in 1000g • 100g / 0.79 = 126.6ml 126.6 + 900 = 1026.6ml • 100 x 1000/1026.6 = 97.4g 97.4g / 47.06 = 2.11M

  11. Calculations • %Concentration to Molarity • 1% (w/v) = 1g per 100ml = 10g in 1000ml • xM = mass/RMM in 1000ml

  12. Calculations • Titrations • MAVA = MBVB

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