Most gases become less soluble in water as the temperature increases.What can be concluded about the signs of ΔH_soln and ΔS_soln in this case? A)ΔH_soln is negative and ΔS_soln is negative. B)ΔH_soln is negative and ΔS_soln is positive. C)ΔH_soln is positive and ΔS_soln is negative. D)ΔH_soln is positive and ΔS_soln is positive.

Question

Quizplus · Accepted Answer

When gases become less soluble in water as temperature increases, it indicates an exothermic process (releasing heat). The negative ΔH_soln value tells us that the dissolution process is exothermic. Additionally, when gases become less soluble in water, they become more disorderly (entropy increases) meaning that ΔS_soln is negative. Therefore, the best choice is A, where both ΔH_soln and ΔS_soln are negative.

Most Gases Become Less Soluble in Water as the Temperature