Determination thiocyanate in waste water using UV-Vis spectro

Determination thiocyanate in waste water using UV-Vis spectro

University

5 Qs

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Determination thiocyanate in waste water using UV-Vis spectro

Determination thiocyanate in waste water using UV-Vis spectro

Assessment

Quiz

Chemistry

University

Hard

Created by

Siswati Lestari

Used 2+ times

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5 questions

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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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