KVV E-Modules

If you need to prepare an emulsion with a required HLB of 12, and you have Tween 80 (HLB = …

A: 30% B: 50% C: 72% D: 28%

The alligation method is used in HLB calculations to:

A: Determine the stability of the emulsion B: Calculate the required HLB value for the oil phase C: Find the correct ratio of two surfactants to achieve a target HLB D: Measure the viscosity of the emulsion

The required HLB for the oil phase in an o/w emulsion is calculated as:

A: Average of the oil phase components' HLB values B: Weighted average based on the proportion of each oil C: The HLB of the surfactant used D: The sum of the HLBs of all surfactants

When selecting surfactants for an emulsion, the most stable o/w emulsion is achieved when:

A: Only one surfactant is used B: The mixture can tolerate the largest quantity of water and remain clear C: The surfactant is only soluble in the oil phase D: The surfactant is only soluble in the water phase

For a mixture containing 25% Span 60 (HLB = 4.7) and 75% Tween 60 (HLB = 14.9), what is the …

A: 6.5 B: 10.9 C: 12.3 D: 14.2