A sample of benzoic acid, which should be pure white, was found to have a grayish...
A sample of benzoic acid, which should be pure white, was found to have a grayish color after recrystallization. The melting point was correct, and the melting point range was small. Explain why the melting point was still correct and occurred over a narrow range in spite of the grayish tint.
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A sample of benzoic acid, which should be pure white, was found
to have a grayish...
12) Water was found to be a suitable solvent for recrystallization of benzoic acid. How should...
12) Water was found to be a suitable solvent for recrystallization of benzoic acid. How should the solution of benzoic acid be prepared during the recrystallization? a. by dissolving the solid in a maximum volume of the boiling solvent b. by dissolving the solid in a minimum volume of the boiling solvent C. by adding 10 ml of hot solvent, in small portions to the solid and stirring until the solid dissolves x d. by adding 10 ml of the...
How would a mixture of naphthalene and benzophenone behave on a TLC plate with hexanes /...
How would a mixture of naphthalene and benzophenone behave on a TLC plate with hexanes / acetone as the eluent? Compare the polarity of these two compounds. Outline the most commonly used procedure for the purification of an impure solid material using the technique of recrystallization. Why is acetone such a popular solvent? Point out one drawback in terms of safety considerations. Your final product might be impure since you suspect decomposition might have occurred. When determining the melting point...
Methanol and water mixtures were found to be suitable for recrystallization based upon solubility test results...
Methanol and water mixtures were found to be suitable for recrystallization based upon solubility test results for the reaction product mix. Explain why this might not be a good idea besides the yield may suffer (why?) or mixed solvents are difficult to work with. Here are the procedures for the lab if this helps: Synthesis of Nitrated Phenylacetic Acid The instructor will assign each student to either 90% fuming nitric acid or 70% nitric acid. **** 90% fuming nitric acid...
1. Palmitic acid (hexadecanoic acid) and Palmitoleic acid both have 16 carbons in the molecule, however...
1. Palmitic acid (hexadecanoic acid) and Palmitoleic acid both have 16 carbons in the molecule, however the two molecules have different melting points. Palmitic acid has a melting point of 63C. Palmitoleic acid has a mellting point of 63C. Explain this difference in melting points based on the structure and intermolecular forces. 2. The baked-on mess found in most dirty ovens consists primarily of fats or oil. Most popular oven-cleaners are just solutions of stron base. After the cleaner is...
Recrystallization of Acetanilide was conducted using water as our solvent. First we had to choose a...
Recrystallization of Acetanilide was conducted using water as our solvent. First we had to choose a solvent based (water was chosen as our solvent due to it not dissolving acetanilide at room temp but dissolved it when heated) Then we performed recrystallizaation, vacuum filtration and then melting point measurements. For the post lab discussion for recrystallization of acetanilide report we have to address several different arguments. The ones below I'm not sure what to focus on to completely defend what...
Powder (shor sten FUNNELS Fitering (long stem 63 Chapter 4 Melting Points, Boiling Points, and Refractive Indices Q...
Powder (shor sten FUNNELS Fitering (long stem 63 Chapter 4 Melting Points, Boiling Points, and Refractive Indices Questions 1. What effect would poor circulation of the melting point bath liquid have on the observed melting point? 2. What is the effect of an insoluble impurity, such as sodium sulfate, on the observed melting point of a compound? 3. Three test tubes, labeled A, B, and C, contain substances with approxi- mately the same melting points. How could you prove the...
What would you expect the observed boiling point to be at 10 torrs of a liquid...
What would you expect the observed boiling point to be at 10 torrs of a liquid which has a boiling point of 300 °C at 760 torrs? (Use Figure) Would it be possible to establish the composition of an unknown binary mixture of two substances from mixture melting-point data? Explain. After recording the R values using as a solvent system ethyl acetate and hexane (1:4), determine what solvent system is needed to obtain values between 0.3-0.4 for each of the...
1 in a certain titration 10.7 ml of 0 205 M NaOH was consumed to bitrate...
1 in a certain titration 10.7 ml of 0 205 M NaOH was consumed to bitrate 20.0 mL of H.SO solution a) White balanced molecular equation of the acid base reaction. 2 pts hi Calculate the moles of NaOH consumed (Show calculations with units at each stage 2 pts and answer with correct sia fig and with units 1 pt) • 200 MOON c) Calculate the moles of H2SO4 present in the sample. (Show calculations with units at each stage...
The picture below is an example of how this assignment should be done. This experiment involves...
The picture below is an example of how this assignment should be
done.
This experiment involves the synthesis of a target molecule using Grignard reagents. You must do the following: 1. Perform a retrosynthetic analysis on the target molecule. The organic starting material (what you have to work backwards toward) is provided. Draw a retrosythetic scheme; use the rightwards double arrow to show functional group transformations and disconnections. Provide synthons and synthetic equivalents for every disconnection made. 2. Propose the...
need help on 1,2,3,4 1. The starting material for aspirin is salicylic acid which is a...
need help on 1,2,3,4
1. The starting material for aspirin is salicylic acid which is a phenol. • (2 pts) Which chemical test will you use to test for unreacted phenol when the aspirin synthesis is completed? (It's a chemical test you have used earlier in the semester) (2 pts) What does a positive test for phenol look like using this test? 2. When finding a melting point experimentally, it is always reported as a range T1-T2. 2a. (3 pts)...
12) Water was found to be a suitable solvent for recrystallization of benzoic acid. How should the solution of benzoic acid be prepared during the recrystallization? a. by dissolving the solid in a maximum volume of the boiling solvent b. by dissolving the solid in a minimum volume of the boiling solvent C. by adding 10 ml of hot solvent, in small portions to the solid and stirring until the solid dissolves x d. by adding 10 ml of the...
Powder (shor sten FUNNELS Fitering (long stem 63 Chapter 4 Melting Points, Boiling Points, and Refractive Indices Questions 1. What effect would poor circulation of the melting point bath liquid have on the observed melting point? 2. What is the effect of an insoluble impurity, such as sodium sulfate, on the observed melting point of a compound? 3. Three test tubes, labeled A, B, and C, contain substances with approxi- mately the same melting points. How could you prove the...
1 in a certain titration 10.7 ml of 0 205 M NaOH was consumed to bitrate 20.0 mL of H.SO solution a) White balanced molecular equation of the acid base reaction. 2 pts hi Calculate the moles of NaOH consumed (Show calculations with units at each stage 2 pts and answer with correct sia fig and with units 1 pt) • 200 MOON c) Calculate the moles of H2SO4 present in the sample. (Show calculations with units at each stage...
The picture below is an example of how this assignment should be
done.
This experiment involves the synthesis of a target molecule using Grignard reagents. You must do the following: 1. Perform a retrosynthetic analysis on the target molecule. The organic starting material (what you have to work backwards toward) is provided. Draw a retrosythetic scheme; use the rightwards double arrow to show functional group transformations and disconnections. Provide synthons and synthetic equivalents for every disconnection made. 2. Propose the...
need help on 1,2,3,4
1. The starting material for aspirin is salicylic acid which is a phenol. • (2 pts) Which chemical test will you use to test for unreacted phenol when the aspirin synthesis is completed? (It's a chemical test you have used earlier in the semester) (2 pts) What does a positive test for phenol look like using this test? 2. When finding a melting point experimentally, it is always reported as a range T1-T2. 2a. (3 pts)...
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