Principles of Instrumental Analysis, 6th Edition
6th Edition
ISBN: 9788131525579
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cenage Learning
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Chapter 14, Problem 14.14QAP
Aluminum forms a 1:1 complex with 2-hydroxy-1-naphthaldehyde p -methoxybenzoylhydraxonal, which absorbs UV radiation at 285 nm. Under pseudo-first-order conditions, a plot of the initial
rate =1.92 c Al- 0.250
Find the concentration of aluminum in a solution that exhibits a rate of 0.53 absorbance units per second under the same experimental conditions.
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For the gas phase isomerization of isopropenyl allyl ether,
CH2=C(CH3)-O-CH2CH=CH2-->CH3COCH2CH2CH=CH2
the rate constant at 405 K is 2.60x10^-5 s^-1 and the rate constant at 440. K is 4.75x10^-4 s^-1.
The activation energy for the gas phase isomerization of isopropenyl allyl ether is ________ kJ.
he activation energy for the gas phase isomerization of cyclobutene is 136 kJ.(CH2)2(CH)2CH2=CHCH=CH2The rate constant at 428 K is 2.88×10-4 /s. The rate constant will be 3.08×10-3 /s at K.
(1) The activation energy for the gas phase isomerization of methyl cis-cinnamate is 174 kJ.cis-C6H5CH=CHCOOCH3trans-C6H5CH=CHCOOCH3The rate constant at 621 K is 8.10×10-5 /s. The rate constant will be 8.42×10-4 /s at_____ K.
(1b)
The activation energy for the gas phase isomerization of methyl cis-cinnamate is 174 kJ.cis-C6H5CH=CHCOOCH3trans-C6H5CH=CHCOOCH3The rate constant at 654 K is 4.57×10-4 /s. The rate constant will be /s
at _______ 695 K.
Chapter 14 Solutions
Principles of Instrumental Analysis, 6th Edition
Ch. 14 - Prob. 14.1QAPCh. 14 - A 0.4740-g pesticide sample was decomposed by wet...Ch. 14 - Sketch a photometric titration curve for the...Ch. 14 - Prob. 14.4QAPCh. 14 - Prob. 14.5QAPCh. 14 - The accompanying data (1.00-cm cells) were...Ch. 14 - A 3.03-g petroleum specimen was decomposed by wet...Ch. 14 - Prob. 14.8QAPCh. 14 - Prob. 14.9QAPCh. 14 - The acid-base indicator HIn undergoes the...
Ch. 14 - Prob. 14.11QAPCh. 14 - Prob. 14.12QAPCh. 14 - Copper(II) forms a 1:1 complex with the organic...Ch. 14 - Aluminum forms a 1:1 complex with...Ch. 14 - Prob. 14.15QAPCh. 14 - Prob. 14.16QAPCh. 14 - Prob. 14.17QAPCh. 14 - Prob. 14.18QAPCh. 14 - Prob. 14.19QAPCh. 14 - Given the Information that...Ch. 14 - Prob. 14.21QAPCh. 14 - Mixing the chelating reagent B with Ni(II) forms...Ch. 14 - Prob. 14.23QAP
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- For the gas phase isomerization of cis-1,2-diphenylethene, cis-C6H5 CH=CHC6H5 → trans-C6H5 CH=CHC6H5 the rate constant at 569 K is 2.11 × 10-4 s¯¹ and the rate constant at 608 K is 2.39 × 10 -3 S The activation energy for the gas phase isomerization of cis-1,2-diphenylethene is | s-¹. S kJ.arrow_forwardA medication has a first order elimination rate constant of 0.344 h-1. What is its half life?arrow_forwardUse the References to access important values if needed for this question. For the gas phase isomerization of methyl cis-cinnamate, cis-C6H5 CH=CHCOOCH3 → trans-C6H5 CH=CHCOOCH3 the rate constant at 669 K is 9.12 x 10-4 s and the rate constant at 711 Kis 5.79 x 107 s-¹. -3 The activation energy for the gas phase isomerization of methyl cis-cinnamate is kJ.arrow_forward
- a plausible mechanism (i) MeCCLi (ii) BRCH 2COME (ii) CH 3CO2Harrow_forwardThe activation energy for the gas phase decomposition of acetic anhydride is 144 kJ. (CH3CO)2O → CH₂=C=O + CH3COOH S The rate constant at 493 K is 5.48 x 10-4 s-1. The rate constant will be 0.00745s¹ at K.arrow_forwardRate information was obtained for the following reaction at 25°C and 33°C; Cr(H2O)6 3+ + SCN¯ ---> Cr(H2O)5NCS2+ + H2O(l) Initial Rate [Cr(H2O)6 3+] [SCN-] @ 25°C 2.0x10-11 1.0x10-4 0.10 2.0x10-10 1.0x10-3 0.10 9.0x10-10 2.0x10-3 0.15 2.4x10-9 3.0x10-3 0.20 @ 33°C 1.4x10-10 1.0x10-4 0.20 a) Write a rate law consistent with the experimental data. b) What is the value of the rate constant at 25°C? c) What is the value of the rate constant at 33°C? d) What is the activation energy for this reaction? e) Can a 4th order reaction occur?arrow_forward
- Rate information was obtained for the following reaction at 25°C and 33°C; Cr(H2O)6 3+ + SCN¯ ---> Cr(H2O)5NCS2+ + H2O(l) Initial Rate [Cr(H2O)6 3+] [SCN-] @ 25°C 2.0x10-11 1.0x10-4 0.10 2.0x10-10 1.0x10-3 0.10 9.0x10-10 2.0x10-3 0.15 2.4x10-9 3.0x10-3 0.20 @ 33°C 1.4x10-10 1.0x10-4 0.20 Can a 4th order reaction occur?arrow_forwardThe activation energy for the gas phase decomposition of acetic anhydride is 144 k). (CH3CO)20→CH2=C=0 + CH3COOH The rate constant at 502 K is 9.94x10 4/s. The rate constant will be 9.74x10 3/s at K.arrow_forward11. A researcher wants to synthesize some pentaaminefluoromanganese(l) starting with pentaaminechloromanganese(l). These are octahedral compounds. In order to identify the mechanism of reaction the researcher increased the concentration of chloride and found that no Mn(NH3)sF is formed. Do you think this is a dissociative or associative mechanism? Draw out the reaction steps. What is the coordination number for the intermediate?arrow_forward
- (d) Consider the reaction: [Co(NH3)5(H₂O)]³+ + X¯ → [Co(NH3)5X]²+ + H₂O (i) Is this an electron transfer or a substitution reaction? Justify your answer. (ii) The reaction rate changes by less than a factor of 2 when X-is varied among Cl, Br, N3, and SCN. What does this observation say about the reaction mechanism?arrow_forwardThe activation energy for the isomerization reaction ofCH3NC in Problem 14 is 161 kJ mol-1, and the reactionrate constant at 600 K is 0.41 s-1.(a) Calculate the Arrhenius factor A for this reaction.(b) Calculate the rate constant for this reaction at 1000 K.arrow_forwardThe activation energy for the gas phase decomposition of 2-bromopropane is 212 kJ.CH3CHBrCH3CH3CH=CH2 + HBrThe rate constant at 672 K is 3.16×10-4 /s. The rate constant will be 3.76×10-3 /s at K.arrow_forward
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