15) John is still thinking, and even better, because he is starting to cool off.

Question

15) John is still thinking, and even better, because he is starting to cool off. He is still contemplating the liquid and solid states in his glass. Why doesn't the water just fly out of his glass? a) (3 pts) He figured he was sweating so much that he was losing too much salt. So, he dissolved some table salt, NaCl in his drink. Describe the intermolecular forces that are occurring between the salt and the water molecules in his drink and explain why they occur. b) (3 pts) Now that wasn't too tasty, so he found some ethanol and he added it to his drink. Ethanol has the structure below. Describe the intermolecular forces that are occurring between the ethanol and the water molecules and why are occur. CH 2 H3C OH

Explanation / Answer

a.

salt = NaCl, ionic, since Cation Na+ and Anion Cl- are present

therefore, they will interact with water, a polar molecules with:

ion-dipole interaction

negative and positive charges from the dipole are interacting with both, cation and anions

They occur mainly due to the positive/negative interaction

b.

ethanol + water are polar - polar solvents

they will have only

dipole-dipole interactions as well ad Hydrogen bonding due to the OH- group in ethanol and H-O hydrogen bonding of oxygen.

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