POSTLAB QUESTIONS Questions 1. Classify each of the solutes as covalent or ionic

Question

POSTLAB QUESTIONS Questions 1. Classify each of the solutes as covalent or ionic (yes/no). Covalent lonic sucrose, C,H2O adine, I calcium chloride, CaCl, sodium chloride, NaCl potassium permanganate, KMnO cholesterol ascorbic acid (vitamin C) ethanol, C,HOH vegetable oil vitamin E hexane, C.H 1. Which solutes would you classify as noapolar? 2. What property do the covalent solutes have in common? 3. Vitamins are classified as water-soluble or fat soluble. How would you classify the two vitamins you tested? Acetic acid is a covalent compound, but when dissolved in water it is a weak electro- lyte. How would you explain this phenomenon? 4. Did you see any change in the color of the indicator in the carhonated water after heating? Explain this result 5.

Explanation / Answer

1. Classification of substances

Sucrose : Covalent

Iodine : Covalent

ammonium chloride : ionic

Calcium chloride : ionic

sodium chloride : ionic

potassium permanganate : ionic

cholesterol : covalent

ascorbic acid : covalent

ethanol : covalent

vegetable oil : covalent

Vitamin E : covalent

hexane : covalent

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1. Non-polar solutes are hexane, cholesterol, Vitamin E, vegetable oil.

2. Covalent solutes are have bonds which are formed by sharing of valence electrons between two atoms.

3. Experiment detail not provided.

4. Acetic acid is a weak electrolyte. The H attached to the oxygen of the -COOH group dissociates in water to form acetate ion and hydronium H3O+ ion. The acetate ion however is formed only to a small extent and in solution both the neutral acetic acid and the ions are present.

5. After heating the CO2 in the system is released and thus the pH of solution would decrease. The indicator would show color for acidic medium.

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