V. What is a mixed melting point? How does it help you in determining th solid?
ID: 1036869 • Letter: V
Question
V. What is a mixed melting point? How does it help you in determining th solid? VI. Calculare the saponification equivalent of ethyl acetate. State all assumptions and show all worlk. Include the complete balanced equation for the reaction. VII. 2.00 g of an unknown mono-cster is hydrolyzed by refluxing with 50.0 mL of 0.500 M NaOH until the reaction is complete. The reaction mixture is cooled and an indicator is added to the still basic solution. Titration to end point with 0.200 M HCI required 48.1 mL a. How many moles of hydroxide remained after hydrolysis of the ester? Show all work including complete balanced equation for the reaction. b. How many moles of hydroxide were consumed in the hydrolysis? Show all work. c. Calculate the saponification equivalent of the unknown ester. Show all work. d. Which ester below is the most likely candidate for the unknown? Why? i. ethyl ethanoate i. Phenyl benzoate ili. Isopentyl acetate 68Explanation / Answer
V. Mixed melting point is a technique to determine the melting point of an unknown soild. It can provide information related to identity and purity of a solid .
Mixed melting point means melting point of a mixture of two compounds with same melting point.
The effect of impurity on the melting point of a soild can used to identify the unknown compound. As for example; if an unknown compound is known to be one of the two posible known compounds (both having same melting point) , then the unknown can be mixed with the known compound. Now if the melting point range is lowered and wider then they are not same compound but if the melting point remains same then they are identical compound.
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