<![CDATA[In this research, the influence of NaOH concentration and gelation pH of the xerogel silica synthesized from quartz sand. It was extracted by NaOH 1, 2, and 3 M to obtain sodium silicate solution and was added by HCl 1M to reach pH value 7, 8, and 9 to become gel. After that it was heated at 80° C for 18 hours (aging process) to get xerogel silica. This result xerogel silica were characterized by FT-IR and XRD and its surface area was characterized by methylene blue. The optimum concentration of NaOH is 1 M with silica yield 33%. Surface area which was obtained by concentration variation of NaOH is 7 to 8 m2 / g. Surface area was not influenced by pH variation and NaOH. Characteristics using FT-IR show typical absorption of Si - O at 400 to 3000cm-1 and phase of silica xerogel by XRD is amorphous. Determination of surface area xerogel silica by methylene blue methode 7.364 m2 / g. Key words: Xerogel, NaOH Variation, pH variation.]]>
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