Why do you add saturated NaHCO3 to your crude aspirin? Why do you later add 3M HCl?
Why do you add saturated NaHCO3 to your crude aspirin? Why do you later add 3M HCl?
Homework Answers
Aspirin is insoluble in water. However, Sodium bicarbonate reacts vigorously, producing carbon dioxide gas, which also produces enough agitation to allow the active ingredients to dissolve.
The main purpose of the sodium bicarbonate is to deprotonate the carboxylic acid in acetylsalicylic acid to produce a sodium acetylsalicylate salt which is much more soluble in water (due to the presence of a charged carboxylate group). The reaction between NaHCO3 and acetylsalicylic acid yields H2CO3 (hence, H2O + CO2).
Later on, the sodium salt is again converted to acid form by HCL.
Add Answer to:
Why do you add saturated NaHCO3 to your crude aspirin? Why do you later add 3M HCl?
Write an equation showing why the crude aspirin dissolves in the saturated NaHCO_3 solution.
Write an equation showing why the crude aspirin dissolves in the saturated NaHCO_3 solution.
9. Then add slowly while mixing 1 mL of saturated sodium bicarbonate solution (NaHCO3) -IT WILL...
9. Then add slowly while mixing 1 mL of saturated sodium bicarbonate solution (NaHCO3) -IT WILL BUBBLE! Add additional drops of saturated sodium bicarbonate solution with mixing until no additional bubbling occurs Congratulations! You have just made your first ester. Now you want to separate your ester product from the other stuff in the reaction mixture. CTQ3 Sodium bicarbonate is a base. How will it interact with any carboxylic acid molecules still present in your reaction mixture? 10. Add 1mL...
You add 2 mL of 3M HCl to the above benzoate solution and tested the pH was 3.1. Given that the pka of benzoic acid...
You add 2 mL of 3M HCl to the above benzoate solution and
tested the pH was 3.1. Given that the pka of benzoic acid is 4.1,
what are the ratios of sodium benzoate to benzoic acid in the
reaction?
You made a solution of sodium benzoate by dissolving 1.9 grams of sodium benzoate in 20 mL of distilled water. Calculate its molarity. (MW of sodium benzoate is 144 g)
In your procedure you will add HCl to a mixture of CaCO3 and SiO2- when you...
In your procedure you will add HCl to a mixture of CaCO3 and SiO2- when you add HCL to this mixture, what gas is produced?
POST-LAB QUESTIONS: 1. Give two physical properties you observed in your crude (unpurified) aspirin sample. 2....
POST-LAB QUESTIONS: 1. Give two physical properties you observed in your crude (unpurified) aspirin sample. 2. If the theoretical yield of a reaction was calculated to be 3.11g and the actual yield was 2.65g, what was the percent vield for the reaction? Show formula and all work. 3. If a melting point range is 119.5°C to 125.8°C, what can you say about the sample? (Exp. 11, version 5) Page 9 of 10
2. While caffeine is very soluble in water, aspirin is only minimally soluble. a. Clearly explain...
2. While caffeine is very soluble in water, aspirin is only minimally soluble. a. Clearly explain why you think caffeine is soluble in water. b. In order to dissolve the aspirin, I had to use a sodium hydroxide solution (this is why you had to add HCl to the separatory funnel.) Clearly explain how the use of a sodium hydroxide solution allowed the aspirin to dissolve. Structures/reaction(s) will likely help your answer.
2. How many ml of 10.0M HCl do I need to add to 100ml of 1.00M...
2. How many ml of 10.0M HCl do I need to add to 100ml of 1.00M
NaOH to get a solution with pH = 7?
3. 75.0ml of 1.00M HCl is added to 100ml of 1.00M NaOH. what is
the pH of the resulting solution?
If I can get help with these two, I can do the others. Thank
you.
2. (1pt) How many ml of 10.0M HCl do I need to add to 100ml of 1.00M NaOH to get...
What conclusions did you draw about the synthesis and purity of your aspirin product by comparing...
What conclusions did you draw about the synthesis and purity of your aspirin product by comparing the melting point of your CRUDE and PURE products to the literature values? Answer in one-three sentences (8 pts)
In reference to: (Polymerization; Nylon-6,6 Organic Chemistry Lab) 1. Why do you add hydroxide to your...
In reference to: (Polymerization; Nylon-6,6 Organic Chemistry Lab) 1. Why do you add hydroxide to your hexanediamine solution? What would occur if you did not add it?
why is it important that you add phenolphthein indicator solution to the vinegar solution prior to...
why is it important that you add phenolphthein indicator
solution to the vinegar solution prior to beginning the
titrati
3. In Part IV of the Procedure, you added 6M HCl to the Discarded Solutions beaker containing excess NaOH solution. HCl reacts with NaOH as shown in Equation 5. HCl(aq) + NaOH(aq) -NaCl(aq) + H2O(l) (Eq.5) Briefly explain why it would be hazardous to dispose of either your NaOH solution or 6M HCl in the drain, yet it is safe to...
Write an equation showing why the crude aspirin dissolves in the saturated NaHCO_3 solution.
9. Then add slowly while mixing 1 mL of saturated sodium bicarbonate solution (NaHCO3) -IT WILL BUBBLE! Add additional drops of saturated sodium bicarbonate solution with mixing until no additional bubbling occurs Congratulations! You have just made your first ester. Now you want to separate your ester product from the other stuff in the reaction mixture. CTQ3 Sodium bicarbonate is a base. How will it interact with any carboxylic acid molecules still present in your reaction mixture? 10. Add 1mL...
You add 2 mL of 3M HCl to the above benzoate solution and
tested the pH was 3.1. Given that the pka of benzoic acid is 4.1,
what are the ratios of sodium benzoate to benzoic acid in the
reaction?
You made a solution of sodium benzoate by dissolving 1.9 grams of sodium benzoate in 20 mL of distilled water. Calculate its molarity. (MW of sodium benzoate is 144 g)
POST-LAB QUESTIONS: 1. Give two physical properties you observed in your crude (unpurified) aspirin sample. 2. If the theoretical yield of a reaction was calculated to be 3.11g and the actual yield was 2.65g, what was the percent vield for the reaction? Show formula and all work. 3. If a melting point range is 119.5°C to 125.8°C, what can you say about the sample? (Exp. 11, version 5) Page 9 of 10
2. While caffeine is very soluble in water, aspirin is only minimally soluble. a. Clearly explain why you think caffeine is soluble in water. b. In order to dissolve the aspirin, I had to use a sodium hydroxide solution (this is why you had to add HCl to the separatory funnel.) Clearly explain how the use of a sodium hydroxide solution allowed the aspirin to dissolve. Structures/reaction(s) will likely help your answer.
2. How many ml of 10.0M HCl do I need to add to 100ml of 1.00M
NaOH to get a solution with pH = 7?
3. 75.0ml of 1.00M HCl is added to 100ml of 1.00M NaOH. what is
the pH of the resulting solution?
If I can get help with these two, I can do the others. Thank
you.
2. (1pt) How many ml of 10.0M HCl do I need to add to 100ml of 1.00M NaOH to get...
why is it important that you add phenolphthein indicator
solution to the vinegar solution prior to beginning the
titrati
3. In Part IV of the Procedure, you added 6M HCl to the Discarded Solutions beaker containing excess NaOH solution. HCl reacts with NaOH as shown in Equation 5. HCl(aq) + NaOH(aq) -NaCl(aq) + H2O(l) (Eq.5) Briefly explain why it would be hazardous to dispose of either your NaOH solution or 6M HCl in the drain, yet it is safe to...
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