CHEM 212 Chapter Notes -Sodium Benzoate, Solvent, Benzoic Acid

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21 Nov 2012

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(a) benzoic acid itself in water is insoluble due to the hydrophobic benzene ring which disrupt the h-bonds between water-water and water-benzoic acid. It is more soluble i ether as it shares same properties with ether in molecular terms. Since it is an ionic solid, therefore, it is soluble in water since due to polar properties of water, all polar and ionic solids dissolve in water. (c) 1. Ether has lower density than water which means that top layer will be ether and bottom layer will be water. This means that benzoic acid will be present in top layer: since on mixing with naoh, benzoic acid forms sodium benzoate which is more soluble in water, therefore, benzoic acid will be in 3m naoh layer. Since, ccl4 has more density than water, therefore, ccl4 will be bottom later and 3m naoh will be top layer.

Related Questions

I need help with problem 4 & 5 , this is a homework sheet, can someone explain their answer to so I under stand , thanks!

Why do ionic compounds dissolve well in water? Select all that are true.

Question 5 options:

Because water and ionic compounds are both polar

Water molecules have partial charges that attract the ions in the solid compound, causing it to dissociate into separated ions

Because organic compounds are nonpolar

Water molecules can surround an ion, and neutralize the ion's charge using either it's partial positive or negative side.

The individual ions are solvated by water molecules which stabilizes the ions

2. Which compound is soluble in ether but not soluble in aqueous sodium hydroxide?

Question 2 options:

	ArOH
	Ar
	ArCOOH

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When you have a two-layer mixture of water and tert-butyl methyl ether, what physical property of these liquids assures you that the ether is the top layer?

Question 4 options:

low density was my answer was

You perform each extraction twice, first with 1 mL and second with 0.15 mL. Why is the second extraction necessary?

Question 8 options:

	several small extractions is better than one large one
	to remove any orgnaic material contaninating tube 2
	to remove any remaining neutral compound

7. Which of the following reactions is not favorable?

Question 7 options:

	ArCOOH + NaOH â ArCOO^-Na⁺ + H₂O
	ArOH + NaHCO₃ â ArO^-Na⁺ + CO₂ + H₂O
	ArCOOH + NaHCO₃ â ArCOO^-Na⁺ + CO₂ + H₂O

9.Why is phenol more acidic than an aliphatic alcohol?

Question 9 options:

	Its conjugates baseâs negative charge is localized on the oxygen
	Phenols have a stronger O-H bond
	Only the phenol can form hydrogen bonds
	Its conjugated base is stabilized by resonance

Which aqueous base reacts with a carboxylic acid but not with phenol? Why?

Question 10 options:

	Sodium bicarbonate, it is a weaker base and will only react with strong acids
	Sodium hydroxide, it is a strong base and will only react with strong acids
	Sodium bicarbonate, it is a weak base and will only react with weak acids
	Sodium hydroxide, it is a strong base and will only react with weak acids

CHEM 212 Chapter Notes -Sodium Benzoate, Solvent, Benzoic Acid

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