No need to answer number 1 POSTLAB QUESTIONS 1. This experiment should give Avog

Question

No need to answer number 1 POSTLAB QUESTIONS 1. This experiment should give Avogadros number but probably does not. However, is the result within the general range of Avogadro's number? 2. Why is the oleic acid diluted in the solution used in this experiment? 3. What is the purpose of the lycopodium powder 4. The assumption was made that the oleic acid molecule was a cube. Looking at the model of the oleic acid molecule on the first page of this experiment, is that assumption likely to be correct? Explain your reasoning. 5. Discuss the value obtained for the number of molecules in 1 cm3 of oleic acid. 6. Why was the position of the meniscus very important in Step 5 of the procedure?

Explanation / Answer

Answer 2.

Oleic acid dissolves in ethanol and is not soluble in water and forms a layer above the water surface. When a a drop from the solution of oleic acid and ethanol is poured onto water surface ( lined with lycopodium powder) the ethanol gets dissolved in water while the oleic acid molecules stands up with thier hydrophillic end on the water suface.

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