Rice husk ash is a good source of silica. Almost 95% silica content is present in the RHA. Silica is used as a raw material for manufacture of glass, rubber etc. Rice husk ash is used for the extraction of silica because RHA is economically viable compared with other sources. In the present study silica is extracted from rice husk ash using sodium hydroxide and conc. HCl as solvents at different temperatures ( c), time (hr), concentration (N) respectively...