Hydrolysis of SiF4 in alkaline medium produces
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The most characteristic reaction of silicon tetrafluoride is that with water, by which gelatinous silica and hydrofluosilicic acid (H2SiF6) are formed. The first reaction is one of hydrolysis:
SiF4 + 3H2O = H2SiO3 + 4HF;
but this hydrolysis is not perfect, for silicon tetrafluoride combines with hydrogen fluoride to form hydrofluosilicic acid, H2SiF6, which can exist in aqueous solution:
2SiF4 + 4HF = 2H2SiF6;
consequently the complete reaction is
3SiF4 + 3H2O = H2SiO3 + 2H2SiF6.
Hence it will be understood that when silicon tetrafluoride is passed into a concentrated solution of hydrogen fluoride, hydrofluosilicic acid is formed without separation of silicic acid.
.....hope it helps
SiF4 + 3H2O = H2SiO3 + 4HF;
but this hydrolysis is not perfect, for silicon tetrafluoride combines with hydrogen fluoride to form hydrofluosilicic acid, H2SiF6, which can exist in aqueous solution:
2SiF4 + 4HF = 2H2SiF6;
consequently the complete reaction is
3SiF4 + 3H2O = H2SiO3 + 2H2SiF6.
Hence it will be understood that when silicon tetrafluoride is passed into a concentrated solution of hydrogen fluoride, hydrofluosilicic acid is formed without separation of silicic acid.
.....hope it helps
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