Answer:
Answer has been given below.
Explanation:
- According to Beer's law-
- represents molar absorptivity of a solution, c represents molarity of solution and l represents cell thickness.
- Measurement of absorption is done by taking solutions of a particular solute with different concentrations. A particular solute has a particular maximum absorption wavelength. So absorption experiment is done by keeping this maximum absorption wavelength constant.
- remains constant for a particular solute and a particular absorption wavelength.
- During absorption experiment, same cuvette with a particular cell thickness is used. So "l" remains constant during experiment.
- So the variables are "c" and "A" as absorption depends on concentration of solution.
- Therefore Beer's law can be considered as y=mx relation, where y is equivalent to "A" , x is equivalent to "c" and m is equivalent to "".
- Now, y=mx represents a straight line passing through origin. Therefore y-intercept of any Beer's law plot equal to zero.
Answer:
After the solution is heated, but before additional solute is added
Explanation:
An unsaturated solution is a solution that contains less solute than it can normally hold at a given temperature. Hence an unsaturated solution can still dissolve more solute.
When the solution is heated, the saturated cold solution becomes an unsaturated hot solution which is capable of dissolving more solute at this point.
Once more solute is dissolved, the solution becomes saturated again just before it begins to cool since no more solute dissolves in the solution at some point before cooling and addition of seed crystals.
Compare them accordingly with the formula of E=hc/wavelength
Answer:
Of the main group elements, fluorine has the highest electronegativity (EN = 4.0) and cesium the lowest (EN = 0.79). This indicates that fluorine has a high tendency to gain electrons from other elements with lower electronegativities.
Explanation: