To 15ml of
the prescribed solution add 1ml of dilute nitric acid R and pour the
mixture as a single addition into a test-tube containing 1 ml of silver
nitrate solution R2. Prepare a standard in the same manner using 10ml of chloride
standard solution (5 ppm Cl)R and 5
ml
of water R. Examine the tubes
laterally against a black background.
After
standing for 5min protected from light, any opalescence in the test solution
is not more intense than that in the
standard.
Reagent
used
§ Dilute Nitric Acid: Dilute 20g of nitric acid to 100ml with water. Contains about12.5% w/v of
HNO3(about 2M).
§ Silver Nitrate Solution: A freshly prepared 5.0% w/v solution of
silver nitrate .
§ Chloride Standard Solution (5 ppm Cl): Dilute 1volume
of a 0.0824% w/v solution of sodium
chloride to 100 volumes with water
immediately before use.
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