Antifoaming surfactants have HLB value of what?

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Multiple Choice

Antifoaming surfactants have HLB value of what?

Explanation:
Antifoaming agents work best when they are lipophilic, meaning they are more oil-soluble than water-soluble. A low HLB value indicates this lipophilic character, so the compound tends to partition at the air–water interface of foam rather than staying dissolved in the aqueous phase. By spreading on the bubble surfaces, it disrupts the surface film, promotes liquid drainage, and helps bubbles coalesce and break, reducing foam. That's why antifoaming surfactants typically have a very low HLB, around 1–3. Higher HLB values indicate more hydrophilic surfactants that stabilize emulsions in water rather than foam, so they’re not suited for defoaming.

Antifoaming agents work best when they are lipophilic, meaning they are more oil-soluble than water-soluble. A low HLB value indicates this lipophilic character, so the compound tends to partition at the air–water interface of foam rather than staying dissolved in the aqueous phase. By spreading on the bubble surfaces, it disrupts the surface film, promotes liquid drainage, and helps bubbles coalesce and break, reducing foam. That's why antifoaming surfactants typically have a very low HLB, around 1–3. Higher HLB values indicate more hydrophilic surfactants that stabilize emulsions in water rather than foam, so they’re not suited for defoaming.

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