Colorimetry

Question 1

what is colour/how is it seen

Answer 1

depending on something chemical composition, different materials will absorb and reflect light of different wave lengths

Question 2

the colour we observe…

Answer 2

is the colour reflected and is complementary colour of the most strongly absorbed wavelength

Question 3

what is colorimetry

Answer 3

a technique used to measure the concentration of ions by the amount of light that is able to pass through a solution

Question 4

how is colorimetry a qualitative technque

Answer 4

because it is used to dtermine the indentity of the solute in a solution

Question 5

how is colorimetry a quantitative technque

Answer 5

because it is used to determine the concentration of a solute in a solution

Question 6

what are the steps in colorimetry

Answer 6

1. light from a light source is ttransmitted through a filter to select the wavelength of light most readily absorbed by the solute 2. solute ions in the test tuube absorb a particular amount of light 3. an electronic detector is used to measure the percentage of light absorbed by the solution

Question 7

how is a calibration curve of absorbance vs concentration created

Answer 7

through measuring the different absorbances of standard soolutions of known concentration

Question 8

monochromator

Answer 8

like colorimetry but more accurate and can select for a single wavelength of light ti use

Question 9

steps of UV spectroscopy/monochromator

Answer 9

the sample is first scanned across multiple wavelenth to assess which is most absorbed by the solution, then we use the strongest absorbed wavelengt6h

Question 10

applications of colorimetryy and uv spectroscopy

Answer 10

identify the contents ioiif blood, assessing the contents for toxicity markers and testing the air for the presence of chromium and lead