Table 5.

pH changes of the geopolymer foam pots (G), the geopolymer foam pots with the addition of mineral solution (GM), and the organic-geopolymer hybrid foams with and without the addition of mineral solution (GC and GCM, respectively) during the two-step neutralisation procedure in 0.5 M HCl. Colour intensity is an indicator of alkalinity (blue). Values represent mean values ± standard deviation (n = 3).

Sample	Initial pH	pH after 1st Neutralisation	pH after 2nd Neutralisation
G	11.18 ± 0.11	8.06 ± 0.13	6.67 ± 0.21
GM	10.25 ± 0.05	8.61 ± 0.95	7.06 ± 0.05
GC	10.59 ± 0.21	8.89 ± 0.27	7.76 ± 0.28
GCM	10.24 ± 0.11	8.62 ± 0.62	7.1 ± 0.08