Quantitative Analysis I
Volumetric Analysis

Quantitative analysis deals with the measurement of the amount or quantity of an element or compound present in a givem sample.

Quantitative analysis can be classified into two: gravimetric analysis which deals with the measurement of mass and volumetric analysis which deals with the measurement of volume.

Acid - base titration

This involves titrating an acid of known concentration against a base or trioxocarbonate(IV) of unknown concentration.

Definition of terms
  1. Stock solution: A stock solution is a known concentrated solution that is often times diluted to some lower concentration for laboratory use.
  2. Working solution: This is a solution that is actually ready for use in the laboratory or for analysis. It is usually gotten from the stock solution
  3. Standard solution: A standard solution is a solution whose concentration is known
  4. Molar solution: This is a solution which contains one mole of a compound in 1dm³ of a solution.
  5. Molar concentration: This is the concentration of a solution in mol/dm³. It is the number of moles of a solute in one dm³ of a solution.
    $${\text{Molar Conc.}} = \frac{\text{Mass Conc.}}{\text{M}}$$ $$\text{where M} = \text{Molar mass} $$
  6. Mass concentration: This is the mass of a solute in gram per dm³ of a solution.

  7. $$\text{Mass conc.} = \text{Molar conc.} × \text{M} $$
Apparatus used in titration
Common Indicators in titration
Indicator Color in Acid Color in Base Color in Neutral pH Range Concentration of Acid
Litmus Red Blue Purple 6.5 - 8.0 Weak Acid or Weak Base
Phenolphthalein Colourless Pink Colourless 8.2 - 10.0 Strong Acid or Strong Base
Methyl Orange Red Yellow Orange 3.1 - 4.4 Weak Acid
Bromothymol Blue Yellow Blue Green 6.0 - 7.6 Weak Acid or Weak Base
Universal Indicator Red Purple Green 0 - 14 Various Acids and Bases
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Summary