About: http://webisa.webdatacommons.org/151389750

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Usually sodium or potassium silicate is one starting material and the other is a strong acid such as sulfuric acid, hydrochloric acid, phosphoric acid, or carbon dioxide or combinations thereof.
http://www.w3.org/ns/prov#wasQuotedFrom	google.es