Acid-Base Indicator Properties of Synthesized Phenylhydrazones: 4-(2-(2,4-Dinitrophenyl) Hydrazono) Methyl)-2 Methoxy Phenol and 4-(2-(2,4-Dinitrophenylhydrazono) Methyl) Benzene-1,3-diol

Table 4

Results showing precision of outcomes from the use of the proposed indicators.

Indicator	Type of titration	No. of drops	Mean ± SD, RSD	One-way ANOVA
IND-X	NaOH vs. HCl	2 drops	10.02 ± 0.162, 1.62%	F (2, 27) = 1.105; No significant difference in the endpoint when a different number of drops are used
		3 drops	10.01 ± 0.120, 1.20%
		4 drops	9.92 ± 0.204, 2.06%
	NaOH vs. CH3COOH	2 drops	9.91 ± 0.129, 1.30%	F (2, 27) = 1.058; No significant difference in the endpoint when a different number of drops are used
		3 drops	9.90 ± 0.149, 1.51%
		4 drops	9.98 ± 0.123, 1.23%
IND-Y	NaOH vs. HCl	2 drops	11.19 ± 0.120, 1.07%	F (2, 27) = 2.241; No significant difference in the endpoint when a different number of drops are used
		3 drops	11.16 ± 0.097, 0.87%
		4 drops	11.10 ± 0.067, 0.60%
	NaOH vs. CH3COOH	2 drops	10.49 ± 0.120, 1.14%	F (2, 27) = 0.2520; No significant difference in the endpoint when different numbers of drops are used
		3 drops	10.47 ± 0.095, 0.91%
		4 drops	10.50 ± 0.067, 0.63%