How does silicon dioxide react with NaOH and HF ?

1.	How does silicon dioxide react with NaOH and HF ?
Answer» Solution :(a) With NaOH : Silicon dioxide REACTS reacts with NaOH to form SODIUM SILICATE (Water glass) ` SiO_(2) + 2 Na OH overset ("HEAT") tounderset ("sodium silicate") (Na_(2) SiO_(3)) +H_(2) O` (b ) With HF : Silicon dioxide reacts with hydrogen fluoride to form silicon tetra fluoride . `SiO_(2) + 4HF to underset ("Silicon tetrafluoride ") (SiF_(4)) + 2 H_(2) O`

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