| 1 | Dab it with a solution of weak acid. | |
| 2 | Both compounds are acids, the former is strong and the latter is weak. | |
| 3 | Air, compressed air, Water, hot water, weak acid, etc. | |
| 4 | These gases may dissolve in water in the atmosphere to form weak acids. | |
| 5 | A white weak acid that is a hydrated form of titanium dioxide. |
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