MEASUREMENT OF pH
To Estimate the pH of given sample of water by pH analysis.
SIGNIFICANCE OF THE TEST:-
The public water supplies pH should be kept between 6.5-8.0.The water should be acidic or alkaline .If pH value does not meet about range necessary of pH correction is to be done .pH imparts also an important factor for biological treatment of waste water .various water treatment process like softening coagulation ,absorption, disinfection etc .pH should be kept at an optimum level .Hence pH of a water and waste water sample is required to be known.
PROCEDURE:-
Electrometer method is used to
measure pH of a given sample using pH meter .The instrument should be calibrate
at first using standard buffer solution known pH .The buffer pH 4.0,7.0.The
electrodes are required to be throughly rinsed with double distilled water after
every use. Before immersing the electrodes in the unknown sample the same
should be dried with tissue paper of fresh cotton.The buffer
reading in the pH meter must be adjusted by manual knob .The temperature of the
experiment would be done at 24 degree c.After
calibration of the electrodes of known pH it should be blotted with tissue
paper and then to be immersed unknown sample .The direct reading given the
value of pH . After calibration of the same electrodes with the known pH should
be blotted with the tissue paper and to be immersed in the known sample . The
direct reading will given the value of pH.
RESULT=
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