| 21. | Hydrofluoric acid was used in glass etching from 1720 onwards.
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| 22. | It dissolves slowly in hydrofluoric acid to give fluorohafnate anions.
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| 23. | This byproduct is a minor industrial source of hydrofluoric acid.
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| 24. | It is insoluble in most acids but soluble in nitric acid and hydrofluoric acid.
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| 25. | Hydrofluoric acid is used to clean the fronts of buildings and etch glass, officials said.
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| 26. | The first step in the processing is the reaction of the oxides with hydrofluoric acid:
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| 27. | Hydrofluoric acid is also toxic, being able to penetrate skin and cause highly painful burns.
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| 28. | The anhydrous compound hydrogen fluoride is more commonly used than its aqueous solution, hydrofluoric acid.
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| 29. | Yellow cake uranium oxide powder was reacted with hydrofluoric acid to form gaseous uranium hexafluoride.
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| 30. | In the late 18th century, hydrofluoric acid was discovered.
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