Question

Determine whether a solution will have a positive or negative enthalpy of solution if the sum of the energy required to break solute-solute interactions and solvent-solvent interactions is less than the energy relaeased wgeb solute-solvent interactions form. Explain.

Answer 1

The steps involved in dissolution:

Step 1: solute breaks apart; this is Endothermic.

Step 2: solvent breaks apart. this is Endothermic.

Step 3: Solvent and Solute bond, this is Exothermic

Recall that

Hdissolution = H1 + H2 + (-H3)

Therefore,

if H1+H2 > H3, this will be endothermic

If H1 + H2 < H3, this will exothermic process --> this is the specific case;

If H1 + H2 = H3, this will be ideal solution

Since H1 + H2 < H3, this will be exothermic, meaning that the solution will increase in temperature due to exothermic behaviour