Determination thiocyanate in waste water using UV-Vis spectro

Quiz
•
Chemistry
•
University
•
Hard
Siswati Lestari
Used 2+ times
FREE Resource
5 questions
Show all answers
1.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
What are the aims of experiment this week? (multiple answers)
to determine the concentration of SCN- in unknown sample
To determine the maximum wavelength of SCN- ions
to prepare a series of standard solutions of thiocyanate
To observe the interaction of thiocyanate ions with UV-light
2.
FILL IN THE BLANK QUESTION
30 sec • 1 pt
At which wavelength do you need to measure the absorbance of SCN- ions using UV-Vis?
3.
MULTIPLE SELECT QUESTION
45 sec • 1 pt
Why do you need to measure absorbance at an optimum wavelength? (multiple answers)
To give maximum correctness
to ensure maximum sensitivy
optimum wavelength correlates to the largest response of analyte
To minimize errors of measurement
4.
MULTIPLE SELECT QUESTION
30 sec • 1 pt
Which statements are correct? (multiple correct answers)
The absorbance is directly proportional to concentration of sample
Depends on molar extinction coefficient of substance
Wavelength is directly proportional to absorbance
The absorbance is directly proportional to the length of light path (width of cuvette)
5.
OPEN ENDED QUESTION
45 sec • 1 pt
Fill in the following substances for your experiment this week:
a. Analyte: ..............
b. Standard solutions: ..............
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