2025 LT 14 Remediation: Spectroscopy, Elect Spect., & Beer's Law

After making a graph of absorbance vs. concentration in a lab determining a solution’s concentration utilizing Beer’s Law, you find the equation for the line is y = 2.15x + 0.75. If the absorbance of the unknown solution was 1.262, what is the concentration of it?

• 0.587 M
• 0.238 M

• 1.70 M

• 3.46 M

What does the variable b represent in Beer's Law?

• concentration

• path length

• molar absorptivity

• absorbance

What does the variable c represent in Beer's Law?

• concentration

• path length

• molar absorptivity

• absorbance

What does the variable ε represent in Beer's Law?

• concentration

• path length

• molar absorptivity

• absorbance

Tags

NGSS.HS-PS4-3

Given the absorbance vs. concentration graph created, what is the molar absorptivity of the substance?

• 0.07

• 0.028

• 1.4

• 0.7

Using the absorbance vs. concentration graph, a student is trying to find the concentration of an unknown solution. If the student measures the absorbance of 0.6, what is the concentration of the solution?

• 0.14 M

• 0.28 M

• 0.7 M

• 0.42 M

Which of the following is the optimum wavelength for analysis?

• 390 nm

• 600 nm

• 520 nm

• 510 nm

Tags

NGSS.HS-PS4-1

In the Beer's Law graph shown, what value does a student look at to determine how "good" of a line the data plotted?

• m

• R²

• b

• y=mx+b

In the Beer's Law graph shown, what unit would the concentration be measured in?

• M^-1cm^-1

• cm

• there is no unit

• Molar

Determine the molar absorptivity from the Beer's Law Graph shown.

• 2.424
• 0.0001

• 1.000

• cannot be solved - absorbance is needed

Tags

NGSS.HS-PS4-1