A mixture is prepared using 29.00 mL of a 0.0718 M weak base (pK, = 4.558), 29.00 mL of a 0.0524 M weak acid (pK, = 3.231) and 1.00 mL of 1.21 x 10-4 M HIn and then diluting to 100.0 mL, where HIn is the protonated indicator. The absorbance measured at 550 nm in a 5.000 cm cell was 0.1298. The molar absorptivity (e) values for HIn and its deprotonated form In at 550 nm are 2.26 x 10 M ¹cm¹ and 1.53 x 10 M-¹cm¹, respectively. What is the pH of the solution? pH = 4.27 What are the concentrations of In" and Hin? [In] = [Hin] = 6.62 x10-7 Incorrect 9.68 x10-7 M M
A mixture is prepared using 29.00 mL of a 0.0718 M weak base (pK, = 4.558), 29.00 mL of a 0.0524 M weak acid (pK, = 3.231) and 1.00 mL of 1.21 x 10-4 M HIn and then diluting to 100.0 mL, where HIn is the protonated indicator. The absorbance measured at 550 nm in a 5.000 cm cell was 0.1298. The molar absorptivity (e) values for HIn and its deprotonated form In at 550 nm are 2.26 x 10 M ¹cm¹ and 1.53 x 10 M-¹cm¹, respectively. What is the pH of the solution? pH = 4.27 What are the concentrations of In" and Hin? [In] = [Hin] = 6.62 x10-7 Incorrect 9.68 x10-7 M M
Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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![A mixture is prepared using 29.00 mL of a 0.0718 M weak base (pK₁ = 4.558), 29.00 mL of a 0.0524 M weak acid
(pK, = 3.231) and 1.00 mL of 1.21 x 10-4 M HIn and then diluting to 100.0 mL, where HIn is the protonated indicator. The
absorbance measured at 550 nm in a 5.000 cm cell was 0.1298. The molar absorptivity (e) values for HIn and its deprotonated
form In at 550 nm are 2.26 x 104 M-¹cm¹ and 1.53 x 104 M-¹cm¹, respectively.
What is the pH of the solution?
pH = 4.27
What are the concentrations of In and Hin?
[In] =
[Hin] =
6.62 X10-7
Incorrect
9.68 x10-7
I
M
M](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F11abd3b3-d2d0-40b0-a4b7-f7018ae8ffb1%2F7ab9ca12-b40e-4b9f-8166-ee94b13bf58b%2F9zx6hhk_processed.jpeg&w=3840&q=75)
Transcribed Image Text:A mixture is prepared using 29.00 mL of a 0.0718 M weak base (pK₁ = 4.558), 29.00 mL of a 0.0524 M weak acid
(pK, = 3.231) and 1.00 mL of 1.21 x 10-4 M HIn and then diluting to 100.0 mL, where HIn is the protonated indicator. The
absorbance measured at 550 nm in a 5.000 cm cell was 0.1298. The molar absorptivity (e) values for HIn and its deprotonated
form In at 550 nm are 2.26 x 104 M-¹cm¹ and 1.53 x 104 M-¹cm¹, respectively.
What is the pH of the solution?
pH = 4.27
What are the concentrations of In and Hin?
[In] =
[Hin] =
6.62 X10-7
Incorrect
9.68 x10-7
I
M
M
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