Organic Chemistry
7th Edition
ISBN: 9780321803221
Author: Paula Y. Bruice
Publisher: Prentice Hall
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Textbook Question
Chapter 2, Problem 69P
a. If an add with a pKa of 5.3 is in an aqueous solutions of solution of pH 5.7, what percentage of the acid is present in its acidic form?
b. At what pH does 80% of the acid exist in its acidic form?
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Chapter 2 Solutions
Organic Chemistry
Ch. 2.1 - Which of the following are not acids? CH3COOH CO2...Ch. 2.1 - Draw the products of the addbase renc1 ion when a....Ch. 2.1 - a. What is the conjugate acid of each or the...Ch. 2.2 - a. Which is a stronger acid: one with a pKa of 5.2...Ch. 2.2 - An acid has a Ka of 4.53 106 in water. What is...Ch. 2.2 - Prob. 6PCh. 2.2 - Antacids are compounds that neutralize stomach...Ch. 2.2 - Are the following body fluids acidic or basic? a....Ch. 2.3 - Draw the conjugate acid of each of the following:...Ch. 2.3 - a. Write an equation showing CH3OH reacting as an...
Ch. 2.3 - Estimate the pKa values of the following...Ch. 2.3 - a. Which is a stronger base: CH3COO or HCOO? (The...Ch. 2.3 - Using the pKa values in Section 2.3, rank the...Ch. 2.4 - Prob. 14PCh. 2.5 - a. For each of the acid-base reactions in Section...Ch. 2.5 - Ethyne has a pKa value of 25, water has a pKa...Ch. 2.5 - Which of the following bases can remove a proton...Ch. 2.5 - Calculate the equilibrium constant for the...Ch. 2.6 - Rank the ions (CH3, NH2, HO, and F) from most...Ch. 2.6 - Rank the carbanions shown in the margin from most...Ch. 2.6 - Which is the stronger acid?Ch. 2.6 - Prob. 22PCh. 2.6 - Rank the halide ions (F, Cl, Br, and l) from...Ch. 2.6 - a. Which is more electronegative, oxygen or...Ch. 2.6 - Which is a stronger acid? a. HCl or HBr b....Ch. 2.6 - a. Which of the halide ions (F, Cl, Br, and l) is...Ch. 2.6 - Prob. 27PCh. 2.7 - What is a stronger acid? a. CH3OCH2CH2OH or...Ch. 2.7 - Prob. 29PCh. 2.7 - What is a stronger base?Ch. 2.8 - Fosamax (shown on the previous page) has six...Ch. 2.8 - Which is a stronger acid? Why?Ch. 2.8 - Prob. 34PCh. 2.9 - Using the table of pKa values given in Appendix I,...Ch. 2.10 - Prob. 36PCh. 2.10 - As long as the pH is not less than _______, at...Ch. 2.10 - A naturally occurring amino acid such as alanine...Ch. 2.10 - For each of the following compounds, indicate the...Ch. 2.11 - Write the equation that shows how a buffer made by...Ch. 2.12 - Draw the products of the following react ions. Use...Ch. 2.12 - What product are formed when each of the following...Ch. 2 - a. Rank the following alcohols from strongest to...Ch. 2 - Which is a stronger base? a. HS or HO b. CH3O or...Ch. 2 - According to the explanations by Lewis, if a...Ch. 2 - a. Rank the following carboxylic acids from...Ch. 2 - Prob. 51PCh. 2 - For the following compound. a. draw its conjugate...Ch. 2 - Rank the following compounds from strongest to...Ch. 2 - Prob. 54PCh. 2 - Prob. 55PCh. 2 - a. Rank the following alcohols from strongest to...Ch. 2 - For each compound, indicate the atom that is most...Ch. 2 - a. Given the Ka values, estimate the pKa value of...Ch. 2 - A single bond between two carbons with different...Ch. 2 - Tenormin, a member of the group of drugs known as...Ch. 2 - From which of the following compounds can HO...Ch. 2 - a. For each of the following pairs of reactions,...Ch. 2 - Prob. 63PCh. 2 - Which is a stronger acid? a. b. c. d.Ch. 2 - Prob. 65PCh. 2 - Given that pH+ pOH = 14 and that the concentration...Ch. 2 - How could you separate a mixture of the following...Ch. 2 - Prob. 68PCh. 2 - a. If an add with a pKa of 5.3 is in an aqueous...Ch. 2 - Calculate the pH values of the following...Ch. 2 - Prob. 1PCh. 2 - Prob. 2PCh. 2 - Prob. 3PCh. 2 - Which of the reactions in Problem 3 favor...Ch. 2 - Prob. 5PCh. 2 - Prob. 6PCh. 2 - Prob. 7PCh. 2 - Which is the stronger acid? a. ClCH2CH2OH or...Ch. 2 - Prob. 9PCh. 2 - Prob. 10PCh. 2 - Which is a more stable base? Remembering that the...Ch. 2 - Which is the Stronger acid?Ch. 2 - Prob. 13PCh. 2 - a. Draw the structure of (CH3COOH (pKa = 4.7) at...
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- The pKa of a weak acid was determined by measuring the pH of a solution containing the weak acid at 0.30 M and its conjugate base at 0.30 M. The measured pH was 8.0. What is the pKa of the weak acid?arrow_forwardGiven that C6H11COOH has a pKa = 4.8 and C6H11N + H3 has a pKa = 10.7, what pH would you make the water layer to cause both compounds to dissolve in it?arrow_forwardYou are supplied with the following: NaCl (Mr = 58.443 g/mol) 2.5 M Tris-Cl, pH 8 oplossing / solution (1 Litre) EDTA, sodium salt (Mr = 380.2 g/mol) 10 % Sodium dodecyl sulfate solution Proteinase K solution (50 mg dissolved in 1 ml ddH2O) You need a digestion buffer consisting of the following: 15 mM NaCl 75 mM Tris-Cl, pH 8 16 mM EDTA, pH 8 0.8 % Sodium dodecyl sulfate 0.75 mg/ml proteinase K Calculate: How will you prepare 500 ml of the digestion buffer? Show all your steps and calculations and remember to explain how exactly you will make it up.arrow_forward
- The pH at the midpoint of a titration between a weak base with a strong acid was 10.9. Using the pKa of the conjugate acid, identify the base in the titration. A.) Ammonia - Conjugate acid pKa = 9.3 B.) Ethylamine - Conjugate acid pKa = 10.9 C.) Phenolate ion - Conjugate acid pKa = 10.00 D.) Acetate ion - Conjugate acid pKa = 4.8arrow_forwardWhat is the pKb of the conjugate base of a weak acid that has a pKa equal to 5.29 at 25ºC?arrow_forwardIn my slide, there is a table summarizing the pKa values for different acids. (1) when ranking the acidity level (how strong the acids are), a low pKa means high acidity. Why is that? (2) Calculate the phosphoric acid solution pH when the ratio of [H2PO4-]/[H3PO4] is 0.8.arrow_forward
- After a buffer solution of carbonic acid (with pKa of 3.75) was added with 1ml of sulfuric acid, the resulting pH of the carbonic acid buffer solution is 1.25. Do you think the carbonic buffer system still works effectively after the addition of the said acid?arrow_forwardThe base ephedrine has a pKa value of 9.6. Calculate the theoretical end point pH when a 0.1 M solution of ephedrine is titrated with 0.1 M HCl.arrow_forwardWhat is the pH of a 0.10 M solution of an acid with a pKA of 8.4?arrow_forward
- Two pKa values are reported for malonic acid, a compound with two COOH groups. Explain why one pKa is lower and one pKa is higher than the pKa of acetic acid (CH3COOH, pKa = 4.8).arrow_forwardWhich statement about the pKa value is false? * A- The pKa value is calculated from the equilibrium constant for the dissociation of the acid. B- The pKa value is a measure of the strength of an acid. C- The pKa value of a given acid gives an indication of the strength of the conjugate base of that acid. D- A larger pKa value indicates a stronger acid and a weaker associated conjugate base. E- All of these statements are correct.arrow_forwardYou are conducting a biochemical experiment with an enzyme that has optimal activity at pH = 10.50. You decide to use carbonate (pKa1 = 6.38, pKa2 = 10.30) as the buffer to keep the pH stable throughout the enzymatic reaction. (Recall that the formula for carbonic acid is H2CO3.) You prepare a 0.6 M solution of carbonate buffer at pH = 10.50. Calculate the concentrations of the major carbonate species in your solution. Show your calculations.arrow_forward
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