In a hurry to complete the experiment, Joseph failed to calibrate the spectrophotometer. As a result, all absorbance values for
2 answers:
will be observed for test solutions if calibration of spectrophotometer is not done.
Further explanation:
Spectrophotometry
It is a technique that is used to measure the absorbance of light as a measure of the intensity of light when light passes through the sample of the solution. The optical instrument used for such purpose is a spectrophotometer.
Lambert-Beer’s Law
This law relates to the absorbance of the species to its concentration and the optical path length through the sample. The mathematical expression for Lambert-Beer’s law is,
Here,
A is the absorbance of the species.
is the molar absorptivity of the species.
<em>l</em> is the optical path length.
<em>c</em> is the concentration of species.
While using a spectrophotometer, calibration is an essential step in determining the absorbance of the sample. This done by using a blank solution (standard solution) and taking its absorbance value as a reference for other solutions. But if the equipment is not calibrated before measuring the absorbance for other solutions, the results will be incorrect.
In the given experiment, the absorbance values of standard solutions are recorded very high. This will lead to incorrect values of absorbance for test solutions. This is because the absorbance of the standard solution is to be used as a reference for the test solutions.
Learn more:
1. Classify the transitions as absorption or emission of light: brainly.com/question/1594022
2. What is the frequency of yellow light? brainly.com/question/5882803
Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Beer-Lambert Law
Keywords: absorbance, Lambert-Beer law, calibration, standard solutions, test solutions, blank solution, spectrophotometry, spectrophotometer.
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Answer : The 'Ag' is produced at the cathode electrode and 'Cu' is produced at anode electrode under standard conditions.
Explanation :
Galvanic cell : It is defined as a device which is used for the conversion of the chemical energy produces in a redox reaction into the electrical energy. It is also known as the voltaic cell or electrochemical cell.
In the galvanic cell, the oxidation occurs at an anode which is a negative electrode and the reduction occurs at the cathode which is a positive electrode.
We are taking the value of standard reduction potential form the standard table.
In this cell, the component that has lower standard reduction potential gets oxidized and that is added to the anode electrode. The second forms the cathode electrode.
The balanced two-half reactions will be,
Oxidation half reaction (Anode) :
Reduction half reaction (Cathode) :
Thus the overall reaction will be,
From this we conclude that, 'Ag' is produced at the cathode electrode and 'Cu' is produced at anode electrode under standard conditions.
Hence, the 'Ag' is produced at the cathode electrode and 'Cu' is produced at anode electrode under standard conditions.
