MEASUREMENT OF pH
Objective :
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=
