1. Indicator dyes are often used to measure the hydrogen-ion concentration. From the measured spectra of an indicator in solution, the ratio of acid to base species and the pH can be calculated: Hin In + H* The molar extinction coefficients are the following: Hin E (300 nm) 10,000 E (400 nm) 2000 In 500 4000 (a) Calculate the ratio of concentrations [In-]/[HIn] for a solution of the indicator that has A (300 nm) = 1.2 in a 1-cm cell and A(400 nm) = 0.7 in a 0.1-cm cell. (b) What is the pH if the pK of the indicator is 5.0?
1. Indicator dyes are often used to measure the hydrogen-ion concentration. From the measured spectra of an indicator in solution, the ratio of acid to base species and the pH can be calculated: Hin In + H* The molar extinction coefficients are the following: Hin E (300 nm) 10,000 E (400 nm) 2000 In 500 4000 (a) Calculate the ratio of concentrations [In-]/[HIn] for a solution of the indicator that has A (300 nm) = 1.2 in a 1-cm cell and A(400 nm) = 0.7 in a 0.1-cm cell. (b) What is the pH if the pK of the indicator is 5.0?
Chapter5: Equilibrium, Activity And Solving Equations
Section: Chapter Questions
Problem 5P
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![1. Indicator dyes are often used to measure the hydrogen-ion concentration. From the measured
spectra of an indicator in solution, the ratio of acid to base species and the pH can be calculated:
Hin In + H*
The molar extinction coefficients are the following:
Hin
E (300 nm)
10,000
E (400 nm)
2000
In
500
4000
(a) Calculate the ratio of concentrations [In-]/[HIn] for a solution of the indicator that has A (300
nm) = 1.2 in a 1-cm cell and A(400 nm) = 0.7 in a 0.1-cm cell.
(b) What is the pH if the pK of the indicator is 5.0?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Ffa81a97d-82b8-418d-a71f-dde9a741645e%2Fe941d20f-af21-4d91-b2e4-3166a050602e%2Ftktq4f_processed.png&w=3840&q=75)
Transcribed Image Text:1. Indicator dyes are often used to measure the hydrogen-ion concentration. From the measured
spectra of an indicator in solution, the ratio of acid to base species and the pH can be calculated:
Hin In + H*
The molar extinction coefficients are the following:
Hin
E (300 nm)
10,000
E (400 nm)
2000
In
500
4000
(a) Calculate the ratio of concentrations [In-]/[HIn] for a solution of the indicator that has A (300
nm) = 1.2 in a 1-cm cell and A(400 nm) = 0.7 in a 0.1-cm cell.
(b) What is the pH if the pK of the indicator is 5.0?
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