Calibration of Auto Titrator

Calibration of Auto Titrator

 

1. CALIBRATION OF pH ELECTRODE

Sr. No.	Standard pH buffers used  at 25oC	Batch No.	Validity
1	Buffer pH 4.01
2	Buffer pH 7.00
3	Buffer pH 9.18

 

Acceptance Criteria:

1. The observed pH of buffer solutions should not be more than ± 0.05.
2. Slope obtained should be between 80% to 120%.

Observations:

 

Buffers used for calibration	Observed pH	Slope obtained
pH 4.01
pH 7.00
pH 9.18

 

1. CALIBRATION OF BURETTE

Sr.No	Volume dispensed by Burette in ml	Specification    ± 1 %	Observation
			Wt. of empty Beaker (W1g)	Wt. of empty Beaker + sample (W2g)	Wt. of sample W3=(W2-W1)	Sample volume = [W3 / 0.99707] ml
1	0.5 ml	0.49 ml- 0.51ml
2	5.0 ml	4.95 ml-5.05ml
3	10.0 ml	9.9 ml- 10.1ml
4	25.0 ml	24.75ml-25.25ml

 D-Density of water is 0.99707 g/ml at 25°C

 

• REPEATABILITY- By Standardization of 0.1 M Sodium Hydroxide Solution

 

1. Preparation- 1:-

Weighed  accurately ___________ g  of  Potassium hydrogen phthalate in  reaction vessels added  _____ ml  of  purified water,  sonicated  for ________ minutes to  dissolve and   titrated with 0.1 M Sodium hydroxide Solution.

2. Preparation- 2:-

Weighed  accurately ___________ g  of  Potassium hydrogen phthalate in  reaction vessels added  _____ ml  of  purified water,  sonicated  for ________ minutes to  dissolve and   titrated with 0.1 M Sodium hydroxide Solution.

3. Preparation- 3:-

Weighed  accurately ___________ g  of  Potassium hydrogen phthalate in  reaction vessels added  _____ ml  of  purified water,  sonicated  for ________ minutes to  dissolve and   titrated with 0.1 M Sodium hydroxide Solution.

Sr. No.	Weight of KHP (gm)	Burette Reading (ml)	Observed Molarity (M)	Mean Molarity (M)	Observed           % RSD
1.
2.
3.

 

KHP= Potassium Hydrogen Phthalate

Acceptance Criteria:

1. The observed Molarity should not be more than ± 0.01M
2. The observed % RSD should not be more than 0.2%

 

Standards/Chemicals Details:

Sr. No.	Standards used	Batch No.	Validity
1	Potassium Hydrogen Phthalate
2	Sodium hydroxide

 

Remark: The result Complies/Does not complies as per acceptance criteria.

 

Performed By: __________                   Checked By: _____

 Date: ____________                                   Date: ______________

 

“End of Document”