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HLB Value Quiz

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Questions and Answers

How is the HLB value of an amphiphilic molecule calculated?

By multiplying the weight percentage of the hydrophilic part by five

By dividing the weight percentage of the hydrophilic part by five (correct)

By subtracting the weight percentage of the lipophilic part from the hydrophilic part

By adding the weight percentage of the hydrophilic part and the lipophilic part

What does a lower HLB value indicate about a surfactant?

It is a non-ionic surfactant

It is an anionic surfactant

It has a hydrophilic character

It has a lipophilic character (correct)

What type of properties do Tweens, polyoxyethylene derivatives of Spans, have?

Lipophilic

Non-ionic

Amphiphilic

Hydrophilic (correct)

What should be the HLB value of an emulsifier to form stable emulsions with an oil phase?

Equal to the HLB value of the oil phase Signup and view all the answers

What are the HLB value ranges for Spans, which are sorbitan esters?

1.8-8.6 Signup and view all the answers

The HLB value of an amphiphilic molecule is obtained by dividing the weight percentage of the hydrophilic part by five. Signup and view all the answers

Tweens, which are polyoxyethylene derivatives of spans, are hydrophilic and have high HLB values in the range of 9.6-16.7. Signup and view all the answers

Spans, which are sorbitan esters, have lipophilic properties and low HLB values in the range of 1.8-8.6. Signup and view all the answers

In order to form stable emulsions, an emulsifier or emulsifier mixture with an HLB value equal to the HLB value of the oil phase should be used. The HLB value of the emulsifier should match the HLB value of the oil phase. Signup and view all the answers

Different formulas can be used to calculate the HLB values of surface active substances. Signup and view all the answers

Study Notes

HLB Value and Calculation

The HLB (Hydrophilic-Lipophilic Balance) value is a measure of the balance between hydrophilic and lipophilic parts of amphiphilic molecules.
The HLB value is calculated by dividing the weight percentage of the hydrophilic part by five, according to Griffin.
A lower HLB value indicates a lipophilic character, while a higher HLB value indicates a hydrophilic character.
Griffin has established an empirical scale to determine the HLB values of surfactants, which enables the determination of the optimum range for each surface active substance effect.

Surfactants and HLB Values

Spans, which are sorbitan esters, have lipophilic properties and low HLB values (1.8-8.6).
Tweens, which are polyoxyethylene derivatives of spans, are hydrophilic and have high HLB values (9.6-16.7).

Emulsification and HLB Values

To form stable emulsions, an emulsifier or emulsifier mixture with an HLB value equal to the HLB value of the oil phase should be used.
Different formulas can be used to calculate the HLB values of surface active substances.

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Description

Test your knowledge of HLB value and calculation with this quiz. Learn about the balance between hydrophilic and lipophilic parts of amphiphilic molecules and understand how to calculate HLB values according to Griffin's empirical scale.