An electrochemical cell consists of a nickel metal electrode immersed in a solution with [Ni 2+ ] = 1.0 M separated by a porous disk from an aluminum metal electrode immersed in a solution with [Al 3+ ] = 1.0 M. Sodium hydroxide is added to the aluminum compartment, causing Al(OH) 3 ( s ) to precipitate. After precipitation of Al(OH) 3 has ceased, the concentration of OH − is 1.0 × 10 −4 M and the measured cell potential is 1.82 V. Calculate the K sp value for Al(OH) 3 . Al(OH) 3 ( s ) ⇌ Al 3+ ( a q ) + 3OH − ( a q ) K sp = ?
An electrochemical cell consists of a nickel metal electrode immersed in a solution with [Ni 2+ ] = 1.0 M separated by a porous disk from an aluminum metal electrode immersed in a solution with [Al 3+ ] = 1.0 M. Sodium hydroxide is added to the aluminum compartment, causing Al(OH) 3 ( s ) to precipitate. After precipitation of Al(OH) 3 has ceased, the concentration of OH − is 1.0 × 10 −4 M and the measured cell potential is 1.82 V. Calculate the K sp value for Al(OH) 3 . Al(OH) 3 ( s ) ⇌ Al 3+ ( a q ) + 3OH − ( a q ) K sp = ?
Solution Summary: The author explains how the value of K_sp is calculated using Nernst formula, E=E°-(RTnFright
An electrochemical cell consists of a nickel metal electrode immersed in a solution with [Ni2+] = 1.0 M separated by a porous disk from an aluminum metal electrode immersed in a solution with [Al3+] = 1.0 M. Sodium hydroxide is added to the aluminum compartment, causing Al(OH)3(s) to precipitate. After precipitation of Al(OH)3 has ceased, the concentration of OH− is 1.0 × 10−4M and the measured cell potential is 1.82 V. Calculate the Ksp value for Al(OH)3.
Al(OH)
3
(
s
)
⇌
Al
3+
(
a
q
)
+
3OH
−
(
a
q
)
K
sp
=
?
Definition Definition Study of chemical reactions that result in the production of electrical energy. Electrochemistry focuses particularly on how chemical energy is converted into electrical energy and vice-versa. This energy is used in various kinds of cells, batteries, and appliances. Most electrochemical reactions involve oxidation and reduction.
(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 18 Solutions
Study Guide for Zumdahl/Zumdahl/DeCoste’s Chemistry, 10th Edition
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Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell