| 41. | The second main catalyst option is hydrofluoric acid.
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| 42. | Hydrofluoric acid is also the strongest of the hydrohalic acids in acetic acid and similar solvents.
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| 43. | Counterintuitively, perhaps, what makes hydrofluoric acid so deadly is not that it is a strong acid.
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| 44. | Skin contact with hydrogen fluoride will cause an immediate reaction with water which produces hydrofluoric acid.
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| 45. | _Fluorosilicic or hydrofluoric acid, used to fluoridate water.
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| 46. | Diluted hydrofluoric acid can be brushed onto the plate to create areas of very delicate tone.
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| 47. | In addition to being a highly corrosive liquid, hydrofluoric acid is also a powerful contact poison.
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| 48. | Ingested fluoride forms hydrofluoric acid in the stomach.
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| 49. | The hydrates crystallize from aqueous hydrofluoric acid.
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| 50. | In 1996, Michael Hanly, a garbage collector, unknowingly came across hydrofluoric acid tossed out with the trash.
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