This work studied the development of geopolymer with rice husk ash, which was used to make an alternative sodium silicate by the aqueous solution with NaOH. Geopolymer mortars used metakaolin as aluminosilicate source. The compressive strength (cured at room temperature) was in the range of 27-32 MPa, showing good performance of the sodium silicate with RHA. With such results geopolymer can be made with waste materials, minimizing social, economic and environmental impacts.