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Fundamentals Of Analytical Chemistry
9th Edition
ISBN:9781285640686
Author:Skoog
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Chapter31: Introduction To Analytical Separations
Section: Chapter Questions
Problem 31.17QAP
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Please help work this out using the conversion factor! 

P Perusall
Chem101
G A solution of citric acid (H:CeHsC
+
Ô https://app.101edu.co
Not syncing
Question 13 of 21
Done
A solution of citric acid (H:CSH:O-) with a known concentration of 0.200 M HsCsHsO7
is titrated with a 0.750 M NaOH solution. How many ml of NaOH are required to
reach the third equivalence point with a starting volume of 25.0 mL H:CGHSO,
according to the following balanced chemical equation:
H:C&H:O, + 3 NaOH – NasCeHsO, +
3 H:0
25.0
mL H:C&HSO7
moLNaOH
molH.eHsO,
20.0
mL NAOH
0.200
mo
molHeH50,
molAaOH
LH:CCHSO7
1
1
0.750
0.200 mol H:CH:O,
25.0 mL H:CeH:O,
3 mol NaOH
1 mol H.CcHsO,
20.0 mL NaOH
LH:CcHsO7
1 mol H:CeHsO,
1 mol H:C&HsO,
0.750 mol NaOH
Incorrect, 0 attempts remaining
The correct answer is 20.0 mL NaOH.
Your ratio between mL H:CsH:O; and mol HsCsHsO, in your first conversion factor is
incorrect. Check the problem statement and then try to determine the correct values
for the factor.
Your mole ratio between H:C&HSO; and NaOH in your third conversion factor is
incorrect. Reconsider the number of mol of HsC&HsO, per mol of NaOH. Checking the
coefficients in the given balanced reaction may help you determine the correct mole
ratio
3:09 PM
P Type here to search
中)
4/28/2021
Transcribed Image Text:P Perusall Chem101 G A solution of citric acid (H:CeHsC + Ô https://app.101edu.co Not syncing Question 13 of 21 Done A solution of citric acid (H:CSH:O-) with a known concentration of 0.200 M HsCsHsO7 is titrated with a 0.750 M NaOH solution. How many ml of NaOH are required to reach the third equivalence point with a starting volume of 25.0 mL H:CGHSO, according to the following balanced chemical equation: H:C&H:O, + 3 NaOH – NasCeHsO, + 3 H:0 25.0 mL H:C&HSO7 moLNaOH molH.eHsO, 20.0 mL NAOH 0.200 mo molHeH50, molAaOH LH:CCHSO7 1 1 0.750 0.200 mol H:CH:O, 25.0 mL H:CeH:O, 3 mol NaOH 1 mol H.CcHsO, 20.0 mL NaOH LH:CcHsO7 1 mol H:CeHsO, 1 mol H:C&HsO, 0.750 mol NaOH Incorrect, 0 attempts remaining The correct answer is 20.0 mL NaOH. Your ratio between mL H:CsH:O; and mol HsCsHsO, in your first conversion factor is incorrect. Check the problem statement and then try to determine the correct values for the factor. Your mole ratio between H:C&HSO; and NaOH in your third conversion factor is incorrect. Reconsider the number of mol of HsC&HsO, per mol of NaOH. Checking the coefficients in the given balanced reaction may help you determine the correct mole ratio 3:09 PM P Type here to search 中) 4/28/2021
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