The Secret of the Main Campus Water-Wells, Arba Minch University, Ethiopia

Table 5

Ca²⁺ and Mg²⁺ hardness determination.

Wells	V (ml)	NEDTA	Eqw CaCO3	Factor	Sv (ml)	Th (mg/l)	N EDTA	V (ml)	Ca^2+ (mg/l)	Mg^2+ (mg/l)
Wtx	5.5	0.01	50	1000	50	55	0.01	4.2	42	13
Whr	6.5	0.01	50	1000	50	65	0.01	4.8	48	17
Wsw	11	0.01	50	1000	50	110	0.01	4	40	70
Wmt	10.8	0.01	50	1000	50	108	0.01	4.2	42	66
Wkr	13.9	0.01	50	1000	50	139	0.01	8.3	83	56
Wmd	14.2	0.01	50	1000	50	142	0.01	3.5	35	107
Wmg	20	0.01	50	1000	50	200	0.01	3.6	36	164

Note. Eqw = equivalent weight; Th = total hardness.