1. CL was tasked to identify the white solid inorganic salt that Dr. Yang gave her. From her preliminary tests, the possible identities were narrowed down to the following: Zn(CN)₂ Ksp (30°C) = 7.30 x 10-12 AgSCN Ksp (30°C) = 5.90 x 10-11 CL chose to investigate the solubility equilibrium of this salt and determine its identity. To a 100.0 mL distilled water at room temperature, CL added the unknown reagent until it no longer dissolves. After letting the mixture stand for 15 mins, she filtered and collected the filtrate in another beaker. From this, a 20.00 mL aliquot was drawn and was titrated with 10.20 mL of 5.00 x 104 M HCI to reach the phenolphthalein endpoint. A. Let X be the titratable species from the dissolved salt. Determine the concentration of X from the titration data.. B. Based on the results of CL's experiment and the provided constants, what is the likely identity of the unknown salt? Show complete solutions to support your answer. When she submitted her report to Dr. Yang, the latter was not convinced because he wants a highly accurate result (i.e. less than 5% error). Thus, to further support her claim, CL performed additional trials at different temperatures, as shown. T, K Calculated Ksp 303.15 323.15 from previous experiment 4.61 x 10-12 1.19 x 10:¹1 283.15 C. Give the equation of the best fit line (with r²) for the corresponding van't Hoff plot. D. Calculate the experimental Ksp of the unknown salt at 298 K.
1. CL was tasked to identify the white solid inorganic salt that Dr. Yang gave her. From her preliminary tests, the possible identities were narrowed down to the following: Zn(CN)₂ Ksp (30°C) = 7.30 x 10-12 AgSCN Ksp (30°C) = 5.90 x 10-11 CL chose to investigate the solubility equilibrium of this salt and determine its identity. To a 100.0 mL distilled water at room temperature, CL added the unknown reagent until it no longer dissolves. After letting the mixture stand for 15 mins, she filtered and collected the filtrate in another beaker. From this, a 20.00 mL aliquot was drawn and was titrated with 10.20 mL of 5.00 x 104 M HCI to reach the phenolphthalein endpoint. A. Let X be the titratable species from the dissolved salt. Determine the concentration of X from the titration data.. B. Based on the results of CL's experiment and the provided constants, what is the likely identity of the unknown salt? Show complete solutions to support your answer. When she submitted her report to Dr. Yang, the latter was not convinced because he wants a highly accurate result (i.e. less than 5% error). Thus, to further support her claim, CL performed additional trials at different temperatures, as shown. T, K Calculated Ksp 303.15 323.15 from previous experiment 4.61 x 10-12 1.19 x 10:¹1 283.15 C. Give the equation of the best fit line (with r²) for the corresponding van't Hoff plot. D. Calculate the experimental Ksp of the unknown salt at 298 K.
Chapter27: Molecular Fluorescence Spectroscopy
Section: Chapter Questions
Problem 27.9QAP
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Question
Transcribed Image Text:E. If a published journal reports that the theoretical value is 8.00 x 10-¹2, will CL's
experiment be sufficient to convince Dr. Yang?
Transcribed Image Text:1.
CL was tasked to identify the white solid inorganic salt that Dr. Yang gave her.
From her preliminary tests, the possible identities were narrowed down to the following:
Zn(CN)2
Ksp (30°C) = 7.30 x 1012
AgSCN
Ksp (30°C) = 5.90 x 10 -11
CL chose to investigate the solubility equilibrium of this salt and determine its identity. To
a 100.0 mL distilled water at room temperature, CL added the unknown reagent until it no
longer dissolves. After letting the mixture stand for 15 mins, she filtered and collected the
filtrate in another beaker. From this, a 20.00 mL aliquot was drawn and was titrated with
10.20 mL of 5.00 x 104 M HCI to reach the phenolphthalein endpoint.
A. Let X be the titratable species from the dissolved salt. Determine the concentration of
X from the titration data.
B. Based on the results of CL's experiment and the provided constants, what is the likely
identity of the unknown salt? Show complete solutions to support your answer.
When she submitted her report to Dr. Yang, the latter was not convinced because he wants
a highly accurate result (i.e. less than 5% error). Thus, to further support her claim, CL
performed additional trials at different temperatures, as shown.
T, K
Calculated Ksp
303.15
323.15
from previous experiment
4.61 x 10-12
1.19 x 10:¹1
283.15
C. Give the equation of the best fit line (with r²) for the corresponding van't Hoff plot.
D. Calculate the experimental Ksp of the unknown salt at 298 K.
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