Can someone explain the entropy change from the dissolution process, and the ent
ID: 707220 • Letter: C
Question
Can someone explain the entropy change from the dissolution process, and the entropy change from the solute,And how about the entropy change from the mixing of thensolute and solvent; will the entropy be as affected from C12H22O11 vs ionic substance?
For example, dissolving C12H22O11 to water.
Compare to dissolving the NaCl to water vs dissolving AlCl3, how much will entropy of the solvent be afffected by this two salts?
Thank you
Can someone explain the entropy change from the dissolution process, and the entropy change from the solute,
And how about the entropy change from the mixing of thensolute and solvent; will the entropy be as affected from C12H22O11 vs ionic substance?
For example, dissolving C12H22O11 to water.
Compare to dissolving the NaCl to water vs dissolving AlCl3, how much will entropy of the solvent be afffected by this two salts?
Thank you
And how about the entropy change from the mixing of thensolute and solvent; will the entropy be as affected from C12H22O11 vs ionic substance?
For example, dissolving C12H22O11 to water.
Compare to dissolving the NaCl to water vs dissolving AlCl3, how much will entropy of the solvent be afffected by this two salts?
Thank you
For example, dissolving C12H22O11 to water.
Compare to dissolving the NaCl to water vs dissolving AlCl3, how much will entropy of the solvent be afffected by this two salts?
Thank you
Explanation / Answer
Entropy is measure of randomness. Aqeous solution have higher entropy than solid species so dissolution process will cause increase in entrpoy.
Dissolving ionic compounds will cause higher entropy change than dissolving molecular solid as ionic compound when dissolve dissociate into ions while molecular comoiunds will remain as neutral molecules after dissolution. Consider the example of ionic compound NaCl vs molecular compound C12H22O11 to water. NaCl after dissolution will give Na+ and Cl- ions in water while C12H22O11 will remain as it is after dissolution so degree of randomness increases after dissolution of ionic compounds and hence entropy increases.
Again if consider example of dissolving NaCl and AlCl3 in water both are ionic compounds but NaCl will give 2 ions i.e. Na+ and Cl- ions in water while A1Cl3 will give 4 ions i.e. one Al3+ and three Cl- ions in water so dissolving AlCl3 will cause higher positive entropy change than dissolving NaCl in water.