Biochemistry: Concepts and Connections (2nd Edition)
2nd Edition
ISBN: 9780134641621
Author: Dean R. Appling, Spencer J. Anthony-Cahill, Christopher K. Mathews
Publisher: PEARSON
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Textbook Question
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Chapter 2, Problem 6P
The weak acid HA is 2% ionized (dissociated) in a 0.20 M solution.
a. What is Ka for this acid?
b. What is the pH of this solution?
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Consider a buffer solution of acetate. The volume is 500 ml, the concentration is 200 mM,
and the pH is 5.0.
a. How many total moles of acetate plus acetic acid are present in the solution? Express
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b. What is the ratio of acetate ions (Ac-) to acetic acid ions (HAc) in the buffer solution (pH
5.0) if the pka is 4.76? Express the answer as x.yz with one digit before and two after the
decimal place.
c. How many moles of acetate are present in the solution? Express your answer to one
decimal place.
d. How many moles of acetic acid are present in the solution? Express your answer to one
decimal place.
Consider the following pH titration curve of a diprotic acid. What is the approximate values for pka 1 and pka 2?
the curve is attached below.
What is the pH of a 0.25 M solution of acetic acid, Ka = 1.8 x 105. What percentage of the acid is
dissociated?
Chapter 2 Solutions
Biochemistry: Concepts and Connections (2nd Edition)
Ch. 2 - Suppose a chloride ion and a sodium ion are...Ch. 2 - Draw two different possible hydrogen-bonding...Ch. 2 - Prob. 3PCh. 2 - 4. What is the pH of each of the following...Ch. 2 - Prob. 5PCh. 2 - The weak acid HA is 2% ionized (dissociated) in a...Ch. 2 - 7. Calculate the pH values and draw the titration...Ch. 2 - What is the pH of the following buffer mixtures?...Ch. 2 - a. Suppose you wanted to make a buffer of exactly...Ch. 2 - Prob. 10P
Ch. 2 - You need to make a buffer whose pH is 7.0, and you...Ch. 2 - Describe the preparation of 2.00 L of 100 glycine...Ch. 2 - Carbon dioxide is dissolved in blood (pH 7.4) to...Ch. 2 - What is the molecular basis for the observation...Ch. 2 - The anno acid arginine ionizes according to the...Ch. 2 - It is possible to make a buffer that functions...Ch. 2 - A student is carrying out a biological preparation...Ch. 2 - Histidine is an amino acid with three titratable...Ch. 2 - Prob. 19PCh. 2 - A biochemical reaction takes place in a 1.00 ml...Ch. 2 - Is RNA-binding enzyme RNase A more likely to have...Ch. 2 - Consider a protein in which a negatively charged...Ch. 2 - Prob. 23PCh. 2 - Prob. 24P
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- A 0.200 M solution of a weak monoprotic acid (HA) has a pH of 2.35. What is the value of K of this acid? a K =2.011e-4 a What is the percent ionization of this acid? Percent Ionization = .10 %arrow_forwardUsing this data, calculate the molarity of the oxalic acid standard solution.arrow_forwardThe weak acid HA is 2% ionized (dissociated) in a 0.20 M solution. (a) What is Ka for this acid? (b) What is the pH of this solution?arrow_forward
- A buffer solution contains an equal concentration of weak acid HX and its conjugate base ion X™. The ionization constant Ka of HX is 2.2 x 10-8. What is the pH of the buffer?arrow_forwardYou need to prepare an acetate buffer of pH 5.43 from a 0.621 M acetic acid solution and a 2.95 M KOH solution. If you have 730 mL of the acetic acid solution, how many milliliters of the KOH solution do you need to add to make a buffer of pH 5.43? The pKa of acetic acid is 4.76. Be sure to use appropriate significant figures.arrow_forwardWhat mass of sodium glycolate (NaC2H3O3) should be added to 400.0 mL of 1.00 M glycolic acid to produce a buffer solution with a pH of 4.00? Ka = 1.47 x 10-4. Please indicate the full solutions.arrow_forward
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- A researcher in Biochemistry is isolating angiotensin-converting enzyme (ACE) from rabbit lung tissue. The protocol requires the use of 500 mL of 0.215 M of phosphate buffer with pH of 7.45. How will he/she prepare this buffer from 2.00 M sodium dihydrogen phosphate and solid disodium hydrogen phosphate (MW = 142 g/mol) The Ka2 of phosphoric acid is 6.2 x 10-8.arrow_forward20 mL solution is 2 M NaOH. If 0.5 M HCl is to be added to this solution, calculate the pH of the resulting solution: A. when 10 mL of the 0.5 M HCl is added to the original solution of the base (initial pH). B. When 50 mL H20 is added to the original solution of the base.arrow_forward200 microliters of a standard solution of 0.200 mg/mL caffeine was mixed with 4.8 mL of 50 mM sodium phosphate buffer, pH 3: methanol (60:40 v/v). What is the concentration of caffeine, in mg/mL, in this solution? Give your answer to two significant figures.arrow_forward
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