Water → Sodium orthosilicate

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Reaction Steps

A reaction mixture having the molar composition 0.303 Na2O:0.0052 Al2O3 :SiO2 :XH2O is first prepared by adding 83.5 parts by weight of soda waterglass (27% of SiO2, 8.43% of Na2O and 0.24% of Al2O3 to 149 parts of water. Thereafter, some of a filter-moist crystalline sodium silicate from a previous experiment (71% weight loss as a result of heating to 1,200° C.; only the amount of water was taken into account in calculating the molar composition) is added. 4.93 parts of 96% strength sulfuric acid are then added slowly, while stirring. The reaction mixture then has the following molar composition: 0.174 Na2O:0.0052 Al2O3 :SiO2 :0.129 Na2SO4 :30 H2O.

Provenance & Evidence