Questions: Driving Question: What is the concentration of methyl orange in bottle Unknown A and Unknown B?

Solution Steps

The task is to determine the concentration of methyl orange in two unknown solutions, labeled as Unknown A and Unknown B. The concentration can be calculated using the formula for dilution:

\[ C_2 = \frac{C_1 \times V_1}{V_2} \]

where \(C_1\) is the initial concentration, \(V_1\) is the volume of the initial solution, and \(V_2\) is the final total volume.

To find the concentration of methyl orange in the unknown solutions, we need to first establish a relationship between concentration and absorbance using known concentrations. This involves preparing a series of dilutions from a known concentration of methyl orange and measuring their absorbance at 463 nm.

Using the table provided, prepare a series of solutions with varying volumes of methyl orange at a known concentration \(C_1\). The total volume for each solution is the sum of the volume of methyl orange and the volume of water added.

For each tube, calculate the final concentration \(C_2\) using the dilution formula:

\[ C_2 = \frac{C_1 \times V_1}{V_2} \]

where \(V_1\) and \(V_2\) are given in the table for each tube.

Measure the absorbance of each solution at 463 nm using a spectrophotometer. Record these values.

Plot the absorbance values against the calculated concentrations to establish a standard curve. This curve will help determine the concentration of methyl orange in the unknown solutions based on their absorbance.

Final Answer