MILK ACIDITY TEST

APPARATUS:

Milk sample, small beaker, burette, pipette and stirrer.

 

CHEMICAL AGENTS:

N/10 NaOH and Phenolphthalein indicator.

PROCEDURE:

Take 10 ml milk in a beaker. Add 2-4 drops of phenolphthalein indicator in milk. Add NaOH drop wise in it and stir it. Continue adding NaOH till pink color

appears. Note the final reading of NaOH.

CALCULATION:

Initial reading of NaOH = 20.1 ml

Final reading of NaOH = 22 ml

Volume of alkali used = 22-20.1 = 1.9 ml

Acidity = volume of alkali used x 0.009 x 100

                         Milk sample

            = 1.9 x 0.009 x 100

                       10

     = 0.171

Acidity must be less than 1 otherwise it indicates that milk is spoiled.

(OFFERED BY Mr.ZEESHAN JAVED)

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