chapter 18 Flashcards
(5 cards)
1
Q
what is a colorimeter
A
- a quantitive technique where the intensity of a colour is is followed
2
Q
what happens to a coloured reactant in the reaction
A
- the intensity of the colour will change
3
Q
what happens in a colorimeter
A
- the wavelength of the light passing through is controlled using a filter
- the amount of light absorbed is measured
- the absorbance is proportional to the concentration
4
Q
how do you construct a calibration curve
A
- prepare standard solutions of known concentration
- select a suitable filter
- zero the colorimeter with distilled water
- measure the absorbance reading of the standard solutions of iodine
- plot a calibration curve of absorbance against concentration
5
Q
what is a calibration curve used for
A
- its a way of converting an absorbance reading into a concentration
