Colorimetry and Solution Analysis

The video tutorial explains how to identify unknown concentrations using colorimetry. It covers the preparation of copper sulfate solutions with known concentrations, ensuring accurate mixing and labeling, setting up the colorimeter, and calibrating it for measurements. The tutorial also demonstrates how to analyze unknown samples by plotting readings on a graph to determine their concentrations.

What is the primary purpose of using a colorimeter in this experiment?

• To calculate the density of the solution

• To measure the light absorbed or transmitted by the solution

• To determine the pH level of the solution

• To measure the temperature of the solution

What is the initial concentration of the copper sulfate solution used in the experiment?

• 0.2 molar

• 0.8 molar

• 1 molar

• 0.4 molar

Why is it important to label the solutions with their concentrations?

• To avoid mixing up the solutions and affecting the graph

• To make the solutions more visible

• To prevent contamination of the solutions

• To ensure the solutions are mixed properly

How is the solution mixed to ensure uniformity?

• By shaking the container vigorously

• By using a magnetic stirrer

• By stirring with a spoon

• By inverting the container with a finger over the top

Which color filter should not be used with a blue solution in the colorimeter?

• Blue

• Green

• Yellow

• Red

What is the purpose of calibrating the colorimeter with distilled water?

• To set a baseline for accurate readings

• To clean the colorimeter

• To ensure the colorimeter is turned on

• To adjust the temperature of the colorimeter

What should be done if the readings of the solutions are outside the expected range?

• Use a different colorimeter

• Perform additional dilutions

• Change the color filter

• Increase the concentration of the solutions

What is the reading obtained for the 0.6 molar solution?

• 15.1

• 6.3

• 2.4

• 1.4

What is the reading for the unknown sample A?

• 9.9

• 24.9

• 15.1

• 30.9

What is the significance of having at least five points on the graph?

• To make the graph easier to read

• To create a curve or line of best fit

• To increase the accuracy of the colorimeter

• To ensure the graph is colorful