SCENARIO:'You!are!given!five!solutions!which!contain!different!concentrations!of!cobalt!(II)!chloride.!You!analyze!
these!samples!using!spectrophotometry,!a!technique!which!measures!light!absorption!and!transmittance.!Below!are!
the!relevant!data:
Concentration'of'CoCl2
(M)
Absorbance
2.4!x!10D4 0.101
4.8!x!10D4 0.272
7.2!x!10D4 0.389
9.6!x!10D4 0.542
1.2!x!10D3 0.681                                                                                                                            Which data go on x axis and y axis

In spectrophotometry, absorbance is typically plotted against the concentration of the solution to analyze the relationship between the two.

- **X-axis**: Concentration of CoCl₂ (M)
- **Y-axis**: Absorbance

This is because concentration is the independent variable (you choose and control the concentration of the solutions), while absorbance is the dependent variable (it changes based on the concentration). By plotting absorbance (y-axis) against concentration (x-axis), you can study how the concentration of the substance affects its light absorption.

Would you like to explore how to calculate the molar absorptivity from this data or other aspects of the experiment?

### 5 Related Questions:
1. What is the equation for Beer-Lambert Law and how is it applied in this experiment?
2. How can we determine the molar absorptivity (ε) from this data set?
3. How does the concentration of a solution affect its absorbance in spectrophotometry?
4. What are potential sources of error in a spectrophotometry experiment?
5. How is the linear relationship between absorbance and concentration useful in determining unknown concentrations?

**Tip:** Always ensure your spectrophotometer is properly calibrated before measuring the absorbance of your samples to avoid systematic errors.

SCENARIO: You are given five solutions which contain different concentrations of cobalt (II) chloride. You analyze these samples using spectrophotometry, a technique which measures light absorption and transmittance. Below are the relevant data
Concentration of CoCl2 (M)
Absorbance
2.4 x 10^-4 M: 0.101
4.8 x 10^-4 M: 0.272
7.2 x 10^-4 M: 0.389
9.6 x 10^-4 M: 0.542
1.2 x 10^-3 M: 0.681
Which data go on the x-axis and y-axis?

Analyze the relationship between absorbance and concentration in spectrophotometry using cobalt (II) chloride solutions. Learn to plot concentration on the x-axis and absorbance on the y-axis, based on the Beer-Lambert Law. This experiment covers linear relationships and key concepts in chemistry and mathematics, suitable for students in Grades 11-12.

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