Determination of Chlorinity of Water without the Use of Chromate Indicator

Table 3

Errors in determining equivalence point: volume (mL) of Ag⁺ required using Na₂HPO₄.

Trial	Mediator; (mM)	Initial.; pH	Crossing; Point	Inflection; Point
1	1.25	8.10	40.0	41.5
2	1.25	8.10	39.9	41.5
3	2.50	8.32	40.0	41.1
4	2.50	7.20	39.9	41.1
5	2.50	7.10	40.0	41.7
6	2.50	7.00	40.0	41.7
Average of Rel. Error			0.1 %	3%