1. How does the melting of pure stearic acid compare to that of the mixture of myristic acid and stearic acid? 2. How does the melting point range of pure stearic acid compare to that of the mixture of myristic acid and stearic acid? 3. What factors in your experiment contributed to the percent deviation of your group's data. 4. How would you improve this experiment so that more precise and accurate data could be obtained?
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The melting of pure stearic acid will occur at a specific temperature, while the melting of a mixture of myristic acid and stearic acid will occur over a range of temperatures. This is because the mixture is not a pure substance, and the different components have Show more…
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Stearic acid $\left(\mathrm{C}_{18} \mathrm{H}_{36} \mathrm{O}_{2}\right)$ and palmitic acid $\left(\mathrm{C}_{16} \mathrm{H}_{32} \mathrm{O}_{2}\right)$ are common fatty acids. Commercial grades of stearic acid usually contain palmitic acid as well. A $1.115 \mathrm{g}$ sample of a commercial-grade stearic acid is dissolved in $50.00 \mathrm{mL}$ benzene $(d=0.879 \mathrm{g} / \mathrm{mL}) .$ The freezing point of the solution is found to be $5.072^{\circ} \mathrm{C}$ The freezing point of pure benzene is $5.533^{\circ} \mathrm{C},$ and $K_{\mathrm{f}}$ for benzene is $5.12^{\circ} \mathrm{C} \mathrm{kg} \mathrm{mol}^{-1} .$ What is the mass percent of palmitic acid in the stearic acid sample?
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