Table 4.
pH changes of basic geopolymer foam pots in the following days after the one-step neutralisation process performed in 0.1 M, 0.5 M, 1 M, and 8 M HCl. Color intensity is an indicator of alkalinity (blue) and acidity (red). Standard deviation was less than 10% of the mean values (n = 3).
| HCl | Following Days after the Neutralisation Process | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1st | 2nd | 4th | 5th | 7th | 8th | 11th | 12th | 28th | 29th | 32nd | 33rd | |
| 0.1 M | 2.79 | 6.94 | 7.75 | 8.52 | 8.83 | 9.35 | 9.33 | 9.38 | 9.27 | 9.4 | 9.26 | 9.36 |
| 0.5 M | 0.55 | 2.67 | 4.39 | 6.35 | 6.35 | 6.36 | 6.38 | 6.38 | 6.38 | 6.37 | 6.36 | 6.32 |
| 1 M | 0.12 | 1.05 | 3.7 | 4.8 | 5.59 | 5.68 | 7.46 | 7.58 | 7.05 | 7 | 6.9 | 6.96 |
| 8 M | 0.13 | 0.15 | 1.91 | 2.84 | 3.65 | 4.2 | 4.67 | 4.2 | 5.75 | 5.7 | 5.68 | 5.66 |