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.
Apparatus used in titration
- Burette: Used to deliver precise volumes of titrant during the titration.
- Pipette: Used for accurate measurement and transfer of specific volumes of solution.
- Beaker: Often used as a reaction vessel to contain the analyte.
- Conical Flask: Used for mixing and reacting solutions during titration.
- Titration Flask: Specially designed for titration experiments, facilitating easy mixing and addition of
reagents.
- Indicator Paper: Used to visually indicate the endpoint of the titration by changing color.
- Stirring Rod: Used for stirring solutions to ensure homogeneity during titration.
- Watch Glass: Placed on top of containers to prevent splattering during titration.
- Funnel: Used for pouring solutions into narrow-necked containers without spilling.
- Dropper: Useful for adding small, precise volumes of reagents to the titration flask.
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 |