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. 2020 Mar 20;6(3):e03533. doi: 10.1016/j.heliyon.2020.e03533

Table 2.

Recorded pH and its associated [Mg2+] at 30oC, with 0.00 and 20.00 ppm maleic acid.

Time, min Recorded pH
 [Mg2+], molar
0.00 ppm 20.00 ppm 0.00 ppm 20.00 ppm
1 9.00 9.00 0.113077 0.113077
2 8.99 8.93 0.110473 0.094933
3 8.98 8.93 0.107871 0.094933
4 8.97 8.93 0.105272 0.094933
5 8.95 8.92 0.100088 0.092370
10 8.94 8.91 0.097506 0.089819
15 8.94 8.91 0.097506 0.089819
20 8.93 8.90 0.094933 0.087282
25 8.93 8.90 0.094933 0.087282
30 8.93 8.90 0.094933 0.087282
35 8.92 8.89 0.092370 0.084760
40 8.92 8.89 0.092370 0.084760
45 8.92 8.87 0.092370 0.079767
50 8.91 8.87 0.089819 0.079767
55 8.91 8.87 0.089819 0.079767
60 8.90 8.86 0.087282 0.077299
65 8.90 8.84 0.087282 0.072431
70 8.89 8.84 0.084760 0.072431