The solubility of strontium oxide, SrO, in water is 22.8 g per 100 mL at 100 °C and 0.69 g per 100 mL at 30 °C. Is the dissolving of strontium oxide in water an endothermic or exothermic process?
SrO + heat ==> Sr(OH)2.
Heat makes the solubility greater (at 100 C than at zero C); therefore, the equation is as above and that is an endothermic reaction.
To determine whether the dissolving of strontium oxide, SrO, in water is an endothermic or exothermic process, we need to look at the solubility values at different temperatures.
The solubility of SrO at 100 °C is 22.8 g per 100 mL, and at 30 °C it is 0.69 g per 100 mL.
When the solubility of a substance increases with temperature, it indicates an endothermic process. This means that heat energy is absorbed from the surroundings during the dissolution process.
In this case, as the solubility of SrO increases from 0.69 g per 100 mL at 30 °C to 22.8 g per 100 mL at 100 °C, it demonstrates that more SrO can dissolve in water at higher temperatures. Therefore, the dissolving of strontium oxide in water is an endothermic process.