Conductometric titration (weak acid-strong base)

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Aim: - 

Titrate the given weak acid against the strong base and determine the endpoint in gms/liter.

 

Apparatus: - 

conductivity bridge, pipette, Beaker, glass rod, micro burette, etc.

 

Chemicals: -

 0.5N NaoH and 0.1N of Acetic acid.

 

Procedure: -

 Pipette out 10 ml of 0.1N acetic acid in a beaker and dip the conductivity cell by adding distilled water till electrodes dip in a solution. Connect the cell to the bridge and other necessary connections are made.

Measure its conductance. Now add 0.2ml of 0.5N NaOH and titrate from the micro burette into the acid solution taken in the beaker. Stir with a glass rod and determine conductance. It increases slowly and after the endpoint, it increases sharply.

Plot a graph of conductance v/s volume of alkali acid from graph endpoint can be calculated. The volume of the alkali at the endpoint is used to determine the normality in grams.

 

 

Observation:-

The volume of NaOH added

Conductance C

 

 

 

 

 

 

 

 

 

 

Calculation:-

N1V1=N2V2

Where

N1= normality of CH3CooH

V1= Volume of CH3CooH

N2= Normality of NaOH

V2 Volume of NaOH

 

 

N2=N1V1 / V2

G/L of NaoH= Normality × equivalent weight


Nature of Graph:-



 
Result:-

1) Normality of NaOH = …….

2) G/L of NaoH=………    


                                                         

 


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