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What temperature is chosen as standard when comparing the solubility of different substances?

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At STP(Standard Temperature and pressure), the temperature is zero degrees Celsius(273 Kelvin) and the pressure is 1 atmosphere. At RTP(Room temperature and pressure), the temperature is 25 degrees Celsius(298 Kelvin) and the pressure is 1 atmosphere.
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Why are substances soluble?

Substances are soluable if disolving the material will result in 1a decrease in free energy. Kinetics will determine how fact something disolves. For most things they are solu