What is the HLB value of emulsifying agent in order to prepare w/o type of emulsion?

Question

Silverson mixer is mainly used for _______

Answer 1

On the HLB scale, low values favor oil-continuous (w/o) systems and high values favor water-continuous (o/w) systems, so each range can be checked against this pattern.

0-3: Correct - this extreme low-HLB range corresponds to strongly lipophilic agents suited to w/o emulsions.
8-18: This higher range corresponds to o/w emulsifying agents.
10-18: This range is even more hydrophilic, associated with solubilizers/o/w systems.
4-6: A moderate low-range value, closer to the w/o side than the o/w side but not the range being tested here.

So the correct answer is 0-3.

Answer 2

A different way to approach HLB ranges is through the surfactant's molecular geometry: an emulsifier with a bulky lipophilic tail relative to a very small hydrophilic head tends to curve around and stabilize the oil phase as continuous, favoring w/o emulsions, and this geometric picture can be matched to each HLB band.

0-3: A surfactant in this range has an extremely small hydrophilic head compared to its lipophilic tail, giving it a strongly curved, oil-preferring geometry that wraps around water droplets, consistent with stabilizing a w/o emulsion.
8-18: Surfactants here have a much larger hydrophilic head relative to the tail, giving the opposite geometric preference, curving to stabilize oil droplets in a continuous water phase (o/w) instead.
10-18: This describes an even more hydrophilic head-dominant geometry, reinforcing an o/w or solubilizing role rather than a w/o one.
4-6: This represents a moderately lipophilic geometry, less extreme than the very low end, and while it can still support water-in-oil systems in some formulations, it isn't the extreme-lipophilic band the question is targeting.

The molecular-geometry picture points to the same extreme low-HLB range.

Hence, the correct answer is 0-3.

Answer 3

A different way to approach HLB ranges is through the surfactant's molecular geometry: an emulsifier with a bulky lipophilic tail relative to a very small hydrophilic head tends to curve around and stabilize the oil phase as continuous, favoring w/o emulsions, and this geometric picture can be matched to each HLB band.

0-3: A surfactant in this range has an extremely small hydrophilic head compared to its lipophilic tail, giving it a strongly curved, oil-preferring geometry that wraps around water droplets, consistent with stabilizing a w/o emulsion.
8-18: Surfactants here have a much larger hydrophilic head relative to the tail, giving the opposite geometric preference, curving to stabilize oil droplets in a continuous water phase (o/w) instead.
10-18: This describes an even more hydrophilic head-dominant geometry, reinforcing an o/w or solubilizing role rather than a w/o one.
4-6: This represents a moderately lipophilic geometry, less extreme than the very low end, and while it can still support water-in-oil systems in some formulations, it isn't the extreme-lipophilic band the question is targeting.

The molecular-geometry picture points to the same extreme low-HLB range.

Hence, the correct answer is 0-3.

What is the HLB value of emulsifying agent in order to prepare w/o type of emulsion?

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