Which of the following concerning the effects of temperature and pressure on solubility is/are correct?
1. All gases become more soluble in a liquid at a fixed pressure when the temperature of the liquid is increased.
2. The dissolution of an ionic compound in water may be exothermic or endothermic, depending on the initial temperature of the solution.
3. The solubility of a liquid in water generally is significantly effected by pressure changes of the system.
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