Measurement of Acidity in water and wastewater

Measurement of Acidity

PURPOSE:

To describe the Laboratory standard operating procedure for measurement of Acidity of Water and Waste Water samples.

SCOPE:

Applicable to the Laboratory for analysis of Water and Waste Water samples, where measurement of Acidity is required.

RESPONSIBILITY:

Lab chemist: Analysis of sample for measurement of Acidity.

Technical Manager: Review of activity

Quality Manager: Implementation and compliance of SOP.

PROCEDURE:

Principle:

Hydrogen ions present in the sample reacts as a dissociation or hydrolysis of solutes react with addition of standard alkali.

Instrument and Equipment:

Conical Flasks, Burette, pipette

Reagents:

Sodium Hydroxide (0.02 N) : Dilute 200 ml 0.1N NaOH to 1000 mL

Phenolphthalein: Dissolve 80mg Phenolphthalein in 100 ml 95% ethyl or isopropyl alcohol or absolute Methanol.

Potassium Hydrogen Phthalate (0.05 N) : Dry approximately 15 g primary standard KHC8H4O4 at 120oC for 2 h .Cool in a desiccator. Weigh 10.0 +/- 0.5 g transfer to a 1 L volumetric flask, and dilute to 1000 ml.

Test Method:

Pipette required ml of sample in to a cleaned conical flask.

Titrate against 0.02 N NaOH using Phenolphthalein as an indicator

End point is from Colorless to pink.

Note down the Burette reading.

Standardized 0.02 N NaOH against 10mL of Potassium Hydrogen Phthalate (0.02 N).

Report result as CaCO3 in mg/L.

Calculation:

ACIDITY mg/L= B.R * 50 * Normality of NaOH*100/Volume of sample

Where 50 is Equivalent wt of CaCO3

Comments

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