A thermometric titration - determine the concentrations of hydrochloric acid and ethanoic acids by thermometric titration and find the enthalpy of neutralization.

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Experiment 12

~ A thermometric titration ~

Lab Report

Aim:

To determine the conecentrations of hychloric acid and ethanoic acis by thermometric titration and find the enthalpy of neutralization.

Procedure:

(I) Titration of HCL with standard NaOH:

1. 50cm3 of NaOH solution is pipetted and transfer to the polystyrene cup, It was allow to stand for a few minutes.

2. The initial temperature was recorded. 5.0 cm3 ofHCL was burette to the cup.

3. The mixture was stirred well by using the thermometer, the temperature was recorded.

4. Sucessive 5.0 cm3 portions of HCL was added and the mixture was stirred, the temperature was recorded after each addition.

5. The adding and recording process was continued till the addition of 50 cm3 of acid.

(II) Titration of CH3COOH with standard NaOH:

1. The procedure was the same as HCL except CH3COOH was used.

Results and Calculations:

(I) Titration of HCL

Volume

Added/ cm3

1.0

5.0

10.0

15.0

20.0

25.0

30.0

35.0

40.0

45.0

50.0

Temp

/oC

25.0