Heating Copper Sulfate Experiment

The video tutorial guides students through a lab experiment involving the weighing of a crucible, both empty and with a copper sulfate solution. It explains the process of heating the solution to evaporate water, observing the color change from blue to gray, and finally weighing the dried mixture. Students learn to calculate the weight of the solution and determine the mole ratio of copper sulfate to water hydrate.

What is the first step in the experiment involving the crucible?

• Heat the crucible to evaporate water.

• Calculate the moles of copper sulfate.

• Record the weight of the empty crucible.

• Measure the weight of the crucible with the solution.

Why is it important to record the weight of the crucible with the copper sulfate solution?

• To determine the volume of the solution.

• To calculate the weight of the solution itself.

• To find the density of the solution.

• To measure the temperature of the solution.

What indicates that the water is being driven off during heating?

• The solution becomes more viscous.

• Vapor is observed coming off.

• The solution starts bubbling.

• The solution turns green.

What color change should be observed to know the heating process is almost complete?

• From blue to dull gray.

• From red to gray.

• From gray to blue.

• From blue to red.

What should be done if there are still blue spots after heating?

• Add more copper sulfate.

• Weigh the crucible immediately.

• Continue heating until the blue spots disappear.

• Add water to the solution.

After heating, what is the next step in the experiment?

• Reheat the solution.

• Weigh the crucible with the remaining substance.

• Add water to the solution.

• Add more copper sulfate.

Why is it necessary to subtract the weight of the empty crucible after the final measurement?

• To measure the weight of the added copper sulfate.

• To determine the weight of the remaining substance.

• To find the weight of the remaining water.

• To calculate the total weight of the experiment.

What is the final color of the substance after all the water is driven off?

• Bright blue

• Dull gray

• Vibrant green

• Deep red

What is the purpose of calculating the ratio of moles of copper sulfate to moles of water hydrate?

• To measure the temperature change during the experiment.

• To determine the purity of the copper sulfate.

• To find the concentration of the solution.

• To understand the chemical composition of the hydrate.