LC Chemistry Volumetric Analysis
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pdstchemistry on February 18, 2012
Acids,bases and titration procedures.
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|Volumetric analysis||The concentration of a solution is determined by reacting the solution with another solution of known concentration.|
|Titration||A laboratory procedure where a measured volume of one solution is added to a known volume of another solution until the reaction is complete.|
|Apparatus used in volumetric analysis|
|A standard solution||Is a solution of precisely known concentration|
|A primary standard|| It must be available in a highly pure state.|
It must be stable in air.
It should have a fairly high relative molecular mass
It must dissolve easily in water.
|1 molar solution||A solution that contains one mole of the solute in one litre of solution eg 1 mol/L of NaOH contains 40g of Sodium hydroxide per litre of solution|
|Parts per million (ppm)||Used for very dilute solutions eg 1 ppm = 1 mg/L|
|Burette precautions|| |
Burette must be vertical, use and then remove funnel, check meniscus, rinse with de-ionised water and then with given solution
|Pipette precautions|| |
In using a Pipette rinse with de-ionised water first and then with given solution. Check meniscus. Do not blow out remainder of liquid into flask and keep tip of pipette in contact with flask