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Lab 4 questions

Lab 4 questions - Graham Barnett 1 Talc or any other...

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Graham Barnett 1) Talc or any other adsorbant should be added to a eutectic mixture to prepare it as a powder 2) The chemical composition of calamine is zinc oxide and 0.5-1.0% ferric oxide. Calamine is used for minor skin irritations, primarily to reduce itching, pain and discomfort. 3) Zinc oxide acts as an antiseptic agent 4) Calcium hydroxide topical solution is used as a vehicle in calamine lotion and as a topical astringent. 5) Bentonite magma, xanthan gum and methylcellulose are all viscosity enhancers to help thicken the product. 6) Bentonite magma is prepared by the following: Bentonite: 50g Purified water: a sufficient quantity to make 1000g Sprinkle the bentonite in portions upon 800g of hot purified water, allowing each portion to become thoroughly wetted without stirring. Allow it to stand with occasional stirring for 24 hours. Stir until a uniform magma is obtained. Add purified water to make 1000g and mix. 7) Calcium hydroxide topical solution is prepared by the following: Calcium hydroxide: 3g
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