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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11.The pKa of a weak acid was determined by measuring the pH of a solution
containing the weak acid at 0.40 M and its conjugate base at 0.60 M. The
measured pH was 7.8. What is the pKa of the weak acid?
a. 8.0
b. 7.8
c. 7.6
d. 7.0
e. 7.4
3.
Calculate the pH of the following solutions. Hint: some parts should
require very little math!
a. A 0.010 M solution of an acid that completely dissociates in solution.
b. A 0.010 M solution of an acid that's conjugate base has a pk of 8.2.
c. A solution that's comprised of 75% acid and 25% conjugate base with a Ka
= 1.4 x 10-4
d. A 0.100 M solution of sodium hydroxide.
7.
Determine the K₁ of each of the following.
a. A 0.00475 M solution of acid HY has a pH of 2.68. What is the Ka of HY?
b. CICH₂COOH has a pKa of 2.87, what is the Ka of the acid?
c. A base has a pKb of 5.14, what is the Ka of the conjugate acid?
d. A 0.25 M solution of a weak acid is 3% dissociated, what is the Ka of the acid?
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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- In 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_forward1. Calculate the pH of a 1 L solution containing 6 mL of 1.5 M acetic acid and 5 mL of 0.4 M sodium acetate. The pKa of acetic acid is 4.76. 2. What is the ratio of conjugate base to acid of buffer (pKa=4.8) with pH=4.8? Show your work. 3. Phosphate buffers are common in biochemistry lab. They can be made from phosphoric acid (H;PO4): pКа-2.15 pKa=7.20 pKa=12.35 H,PO, H,PO, HPO, 2 PO,* Which acid/conjugate base would you use to prepare a buffer at pH=8.11? Which acid/conjugate base would you use to prepare a buffer at pH=11.11? Which acid/conjugate base would you use to prepare a buffer at pH=3.11? 4. Sulfhydryl groups are capable of ionizing (losing a proton). The pka of the side chain of Cys is 8.18. Explain why Cys is drawn as -SH and not -S at physiological pH. 5. Which of the amino acids below would most likely be found on the surface of a protein? Which would be found on the inside of a globular protein? Explain your answer. Asp, Phe, Ser, Leu, Argarrow_forwardSome weak acids and their pKa values are given below. Which one of these acids will have the STRONGEST conjugate base? Select one: a. Phenol; pKa = 10.00 b. Methanoic acid; pKa = 3.75 c. Bromoethanoic acid; pKa = 2.9 d. Methanol; pKa = 15.54arrow_forward
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