From the given equilibrium equations and K a value for the given three reaction systems, The conjugate pair that would be best for preparing a buffer with a pH of 6.96 has to be given. Concept Introduction: Henderson-Hasselbalch equation: The pH can be calculated using Henderson-Hasselbalch equation as follows, pH = pK a + log [ conjugate base] [ weak acid] pH = pK a + log [ A - ] [ HA] Buffer: A buffer is solution containing a mixture of two substances. A buffer solution is characterized by the tendency to resist changes in pH when some limited of amount of acid or base are added to it. A buffer should possess either a weak acid and its conjugate anion that is a conjugate base (weak) or a weak base and its conjugate cation that is a conjugate acid (weak).
From the given equilibrium equations and K a value for the given three reaction systems, The conjugate pair that would be best for preparing a buffer with a pH of 6.96 has to be given. Concept Introduction: Henderson-Hasselbalch equation: The pH can be calculated using Henderson-Hasselbalch equation as follows, pH = pK a + log [ conjugate base] [ weak acid] pH = pK a + log [ A - ] [ HA] Buffer: A buffer is solution containing a mixture of two substances. A buffer solution is characterized by the tendency to resist changes in pH when some limited of amount of acid or base are added to it. A buffer should possess either a weak acid and its conjugate anion that is a conjugate base (weak) or a weak base and its conjugate cation that is a conjugate acid (weak).
Solution Summary: The author explains the Henderson-Hasselbalch equation and the conjugate pair that would be best for preparing a buffer with pH of 6.96.
A buffer is solution containing a mixture of two substances. A buffer solution is characterized by the tendency to resist changes in pH when some limited of amount of acid or base are added to it.
A buffer should possess either a weak acid and its conjugate anion that is a conjugate base (weak) or a weak base and its conjugate cation that is a conjugate acid (weak).
(b)
Interpretation Introduction
Interpretation:
From the given equilibrium equations and Ka value for the given three reaction systems,
The preparation of 100 mL of a buffer with a pH of 6.96 by assuming to have a 0.10 M solutions of each pair has to be explained
Concept Introduction:
Henderson-Hasselbalch equation:
The pH can be calculated using Henderson-Hasselbalch equation as follows,
A buffer is solution containing a mixture of two substances. A buffer solution is characterized by the tendency to resist changes in pH when some limited of amount of acid or base are added to it.
A buffer should possess either a weak acid and its conjugate anion that is a conjugate base (weak) or a weak base and its conjugate cation that is a conjugate acid (weak).
(a) The following synthesis of the molecule shown in the circle has a major problem. What is this problem? (2
pts)
1) HBr
(no peroxides)
2) H-
NaNH2
Br
3) NaNH,
4) CH3Br
5) H2, Pd
(b) Starting with the molecule shown below and any other materials with two carbons or less, write out an
alternate synthesis of the circled molecule. More than one step is needed. Indicate the reagent(s) and the major
product in all the steps in your synthesis. (5 pts)
2024 Fall Term (1) Organic Chemistry 1 (Lec)
CHEM 22204 02[6386] (Hunter College)
(c) Using the same starting material as in part (b) and any other materials win two carpons or less, write out
syntheses of the circled molecules shown below. More than one step is needed in each case. Indicate the
reagent(s) and the major product in all the steps in your synthesis. You may use reactions and products from
your synthesis in part (b). (5 pts)
alt
ons for
Free Response Questions
FRQ 1:
0/5
To spectrophotometrically determine the mass percent of cobalt in an ore containing cobalt and
some inert materials, solutions with known [Co?) are prepared and absorbance of each of the
solutions is measured at the wavelength of optimum absorbance. The data are used to create a
calibration plot, shown below.
0.90-
0.80-
0.70
0.60
0.50
0.40-
0.30
0.20-
0.10-
0.00-
0.005
0.010
Concentration (M)
0.015
A 0.630 g sample of the ore is completely dissolved in concentrated HNO3(aq). The mixture is diluted
with water to a final volume of 50.00 ml. Assume that all the cobalt in the ore sample is converted to
Co2+(aq).
a. What is the [Co2] in the solution if the absorbance of a sample of the solution is 0.74?
13
✗
b. Calculate the number of moles of Co2+(aq) in the 50.00 mL solution.
0.008 mols Co
Please correct answer and don't used hand raiting
Chapter 16 Solutions
Student Solutions Manual for Ebbing/Gammon's General Chemistry
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