Choose the correct answer (A to E). A cream has the following formula:Cetyl alcohol ('Required’ HLB for o/w 15) 9 gWhite soft paraffin (‘Required’ HLB for o/w 12) 8 gPropylene glycol 5 gEmulsifier 6.5 gWater to 100 gIf the surfactants used in manufacture of the cream were polysorbate 60 (HLB 14.9) and sorbitan monostearate (HLB 4.7), how much polysorbate 60 and sorbitan monstearate would be needed?Question 9Answera.3.36 g of polysorbate 60 and 2.63 g of sorbitan monostearateb.4.88 g of polysorbate 60 and 1.12 g of sorbitan monostearatec.None of the answers are correctd.1.12 g of polysorbate 60 and 4.88 g of sorbitan monostearatee.5.66 g of polysorbate 60 and 0.84 g of sorbitan monostearate
Question
Choose the correct answer (A to E). A cream has the following formula:Cetyl alcohol ('Required’ HLB for o/w 15) 9 gWhite soft paraffin (‘Required’ HLB for o/w 12) 8 gPropylene glycol 5 gEmulsifier 6.5 gWater to 100 gIf the surfactants used in manufacture of the cream were polysorbate 60 (HLB 14.9) and sorbitan monostearate (HLB 4.7), how much polysorbate 60 and sorbitan monstearate would be needed?Question 9Answera.3.36 g of polysorbate 60 and 2.63 g of sorbitan monostearateb.4.88 g of polysorbate 60 and 1.12 g of sorbitan monostearatec.None of the answers are correctd.1.12 g of polysorbate 60 and 4.88 g of sorbitan monostearatee.5.66 g of polysorbate 60 and 0.84 g of sorbitan monostearate
Solution
To answer this question, we need to calculate the required HLB for the cream and then determine the amount of each surfactant needed to achieve this HLB.
Step 1: Calculate the required HLB for the cream. This is done by taking a weighted average of the required HLBs for the oil phase ingredients:
(9 g Cetyl alcohol * 15 HLB) + (8 g White soft paraffin * 12 HLB) = 135 + 96 = 231
The total weight of the oil phase is 9 g + 8 g = 17 g
So, the required HLB for the cream is 231 / 17 = 13.59
Step 2: Calculate the amount of each surfactant needed to achieve this HLB. This is done by solving the following equation:
(14.9 * x) + (4.7 * (6.5 - x)) = 13.59 * 6.5
Solving for x gives x = 4.88 g
So, 4.88 g of polysorbate 60 and 6.5 - 4.88 = 1.62 g of sorbitan monostearate are needed.
Therefore, the correct answer is not listed among the options provided. The correct answer should be 4.88 g of polysorbate 60 and 1.62 g of sorbitan monostearate.
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