Soaps consist of compounds such as sodium palmitate, CH3(CH2)14COO–Na+, that hav

Question

Soaps consist of compounds such as sodium palmitate, CH3(CH2)14COO–Na+, that have both hydrophobic and hydrophilic parts. Consider the hydrocarbon part of sodium palmitate to be the "tail" and the charged part to be the "head."

Part A:

Which part of sodium palmitate, head or tail, is more likely to be solvated by water?

Part B:

Grease is a complex mixture of (mostly) hydrophobic compounds. Which part of sodium palmitate, head or tail, is most likely to bind to grease?

Part C:

If you have large deposits of grease that you want to wash away with water, you can see that adding sodium palmitate will help you produce an emulsion. What intermolecular interactions are responsible for this?

Match the words in the left column to the appropriate blanks in the sentences on the right.

dispersion forces

charged COO head

The __________ will experience ion-dipole, dipole-dipole, and hydrogen bonding interactions with water. The _____________ of sodium palmitate will experience ______________ with hydrophobic grease.

dispersion forces

hydrocarbon head charged COO tail hydrocarbon tail

charged COO head

hydrogen bonding

Explanation / Answer

A BRIEF SUMMARY OF SOAP:

Soap contains two parts hydrophobic which is the water hating part, which is generally hydrocarbon part of the saop. It is the tail of the soap molecule. And it involves in diapersion forces with greasy part or dirt.

EXAMPLE :CH3(CH2)14

And the other one is hydrophilic which is water loving part ie it dissolve in water because of its polar nature. It is the head of the molecule. It involves in hydrogen bonding and dipole dipole interactions with water

Example : CH3COO-

So, based on the above summary,

Part A : since water being a polar molecule dissolve polar molecule and here head of the soap molecule is polar, so it is generally solvated by water.

Part B :

The tail part which is hydrocarbon part binds to greasy part.

Part C :

dispersion forces by hydrocarbon or tail part and hydrogen bonding and polar polar interactions by polar or head part are responsible in formation of an emulsion.

Match the following :

Dispersion forces = hydrogen bonding (oprating forces)

Charged COO- TAIL = hydrocarbon head (on combination basis)

Charged COO- head = hydrocarbon tail (on combination basis)

Fill in the blanks:

The.. head or hydrophilic part.... will experience ion-dipole, dipole-dipole, and hydrogen bonding interactions with water.

The ____tail________ of sodium palmitate will experience _______dispersion forces__ with hydrophobic grease.

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