Flow Chart Of Acidity / Alkalinity Test By Ph Meter printable pdf download

Page No.

FC-PF-274

1/4

PESTICIDE FORMULATION & RESIDUE ANALYTICAL CENTRE, PMD, NIPHM, HYDERABAD

Sr. No. in Scope

NABL / NON NABL

Flow chart of Acidity/Alkalinity test by pH meter

Date of Analysis

Sr. No. Step

Execution

Executed By

Sample No.

Name of Sample

Procedure

3.1

Sample Titration

3.1.1

Weigh 2.0 g of sample in 250 mL conical flask.

3.1.2

Note down the S.No. of balance log book

3.1.3

Add 25 mL of methanol and stir for 5 minutes.

3.1.4

Filter through Buchner funnel into the filter flask.

3.1.5

Rinse the conical flask and Buchner funnel with methyl alcohol

(3X5 mL)

3.1.6

Transfer the combined methanol extracts to a 250 mL beaker

rinsing the filteration flask with 10 mL methanol.

3.1.7

Add 10 mL of distilled water.

3.1.8

Calibrate the pH meter with buffer solutions (4.0, 7.0 and 9.2 pH) and

place the pH meter in the sample solution.

3.1.9

Note down the pH of the sample.

3.1.10

Titrate with 0.05 N NaOH or 0.05 N HCl to pH 5.0 at 27 °C and note

the burette reading

3.2

Blank titration

3.2.1

Take 50 mL of methanol and 10mL of distilled water in 250 mL

beaker

3.2.2

Note down the pH of blank

3.2.3

Neutralise with 0.05 N NaOH (if blank is acidic)/ 0.05 N HCl (if blank

is alkaline) to pH 5.0 at 27 °C .

3.2.4

Note the burette reading

3.3

Normality of Sodium hydroxide

3.3.1

Weigh 0.3- 0.4 g of GR grade Potassium hydrogen phthalate (KHP)

in conical flask.

3.3.2

Add 75 mL distilled water and 2-3 drops of phenolphthalein

indicator and titrate with 0.05 N NaOH solution taken in burette.

3.3.3

Note the burette reading

3.4

Normality of Hydrochloric acid

Name of the Laboratory :

Pesticide Formulation & Residue Analytical Centre, PMD, NIPHM, Hyderabad

Flow chart for acidity or

Document No.

FC-PF-272

Document Name

alkalinity by pH meter

Revision No.

Issue Date

01/05/2014

Revision Date

Next Revision Date

01/05/2016

Prepared By

Checked By

Issued By

Approved by

Dr. Rahmath

Dr. Nirmali Saikia

Mr. C.V. Rao

Dr. Abhay Ekbote

(Deputy Technical Manager)

(Technical Manager)

(Quality Manager)

(Director PM)

Flow Chart Of Acidity / Alkalinity Test By Ph Meter

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