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The Silicon Tetrafluoride – Lab Report – felixdelgado Search Essays Sign up Sign in Contact us Tweet Index /Science The Silicon Tetrafluoride The silicon tetrafluoride (STF) reacts with 25% caustic solution to form sodium fluoride, sodium silicate and water (see reaction below). SiF4 + 6NaOH = 4NaF + Na2SiO3 + 3H2O Assuming 200 pounds of.