(a)
Interpretation:
The Keqfor the reaction of benzoic acid with 4-nitroaniline should be determined.
Concept Introduction :
The equilibrium constant, K, expresses the relationship between products and reactants of a reaction at equilibrium.
(b)
Interpretation:
Whether a significant amount of salt is formed after mixing 4-nitroaniline and benzoic acid in equal moles or not needs to be determined.
Concept Introduction :
Equilibrium constant at a specific temperature gives an idea about the concentrations of products and reactants at the equilibrium. If the equilibrium constant is less than 1, it depicts that the amount of product form is less than that of reactants. If the equilibrium constant is more than 1, the forward reaction is favorable and more products are formed.
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EBK EXPERIMENTAL ORGANIC CHEMISTRY: A M
- 1. Which of the following can most likely increase the yield of recrystallized benzoic acid? a. A fluted filter paper was used during cold filtration. b. The receiving flask from hot filtration does not contain a small amount of solvent. c. Activated charcoal was not added to the solution. d. The solution was filtered immediately after hot filtration.arrow_forward8. A student was asked to find the acid and basic radicals in six simple salts provided to him labeled as A,B,C,D,E and F. When he examined them, he observed that sample B was blue in colour and the remaining five salts were white. Answer the following questions. a. Why is concentrated HCl used in performing the flame test and not any other concentrated acid? b. What clue does this blue colour give about sample B? c. What is the importance of a negative test in salt analysis? d. The student is aware that he has to classify the anions into groups. What is the basis of this classification? e. Describe one test which distinguishes a bromide ion from a nitrate ion. f. The student observed that when dil HCl was added to a pinch of sample A. it gave brisk effervescence which turned lime water milky, while sample E gave a gas with rotten egg smell with the same reagent. Identify the acid radicals in sample A and E from the above observation and write the balanced equations involvedarrow_forward5. You have 100 mL of a solution of benzoic acid in water; the amount of benzoic acid in the solution is estimated to be 0.30 g. The distribution coefficient of benzoic acid in diethyl ether and water is approximately 10. Calculate the amount of benzoic acid that would be left in the water solution after four 20-mL extractions with ether. Do the same calculation using one 80-mL extraction with ether to determine which method is more efficient. You must show all your work for this question (all calculations) to get any credit.arrow_forward
- 2. Answer these questions about separating benzoic acid (pKa = 4.2) and aniline (which is basic, pKa of C6H5NH3 + = 4.6) by reverse phase HPLC using a mobile phase mixture of water and methanol. a. Do these things separately for benzoic and aniline: Write a chemical reaction equation for the acid-base equilibrium reaction (the acid or base hydrolysis reaction). At a pH of 3.0, will it be mostly ionized or mostly neutral? At a pH of 6.0, will it be mostly ionized or mostly neutral? Will the ion be positive or negative? Please answer very soon will give rating surelyarrow_forwardWhat is the purpose of performing a blank titration in the assay of ibuprofen? A. To determine the amount of titrant that would react with the indictor. B. To determine the amount of titrant that would react with ibuprofen. C. To determine the amount of titrant that would react with potassium hydrogen phthalate. D. To determine the amount of titrant that would react with free acid in the solvent.arrow_forward-.1.- Calculate-the mass of Ba3(PO4)2 produced from the reaction of 0.85 g NazPO4.12H2O with excess BaCl,.2H,0. What is the purpose of heating the mixture in step 3 for 20 minutes?arrow_forward
- How do the reactions of phenol samples with FeCl3compare? Which structural component of the phenols account for the observation? 2. What compound is the precipitate formed in the Bromine water test? 3. Write the reaction formed in the formation of phenolphthalein. Identify the functional group in phenolphthalein, which is responsible for the indicator property. 4. What is the significance of Millon's test?arrow_forward6. If more polar impurities are desired to be eluted first and then analyte, then at which stage do you need a strong organic solvent, such as methanol, when preparing samples with solid phase extraction A. Conditioning and loading b. Loading and eluting c. Washing and eluting d. Conditioning and washing e. Conditioning and eluting 7. If more polar impurities are desired to be eluted first and then analyte, then at which stage do you need a medium strength solvent, for example a mixture of methanol- water or methanol-buffer, when preparing samples with solid phase extraction A. Washing and loading b. eluting c. Conditioning d. Washing and eluting e. washingarrow_forwardA. What four values are needed to calibrate a CO2 sensor (IRGA)? B. Briefly describe how to obtain those values.arrow_forward
- What is the role of Glycerin in the assay of Boric Acid?I. The reagent prevents the formation of pink color earlier than the expected endpoint.II. The reagent allows the reaction of protons from the acid sample with the hydroxyl ions from the titrant.III. It enhances the water solubility of the difficultly soluble boric acid. a. I, II & III b. II & III c. I & II d. I only e. I & IIIarrow_forward3. Differentiate the dichlorocarbene and Smith-Simmons reagents.arrow_forward5. The pKas of chemicals HX and HY are 5.0 and 7.0 respectively. The pKa of carbonic acid H,CO, 3. is 6.0. If you made up an ether solution of chemicals HX and HY in a separatory funnel, and then added an aqueous solution of sodium bicarbonate NaHCO3 to that separatory funnel, would both HX and HY stay in the ether layer? Or would either or both of them transfer into the aqueous layer? If one goes into the water layer, will it be in its neutral HX/HY form, or in it's deprotonated anionic form? ilter HX: ether layer or water layer? If in the water layer, in HX or X- form? Explain HY: ether layer or water layer? Explain.arrow_forward
- EBK A SMALL SCALE APPROACH TO ORGANIC LChemistryISBN:9781305446021Author:LampmanPublisher:CENGAGE LEARNING - CONSIGNMENT