Copper(II) Sulfate Pentahydrate Experiment

The video tutorial guides students through an experiment to determine the percentage of water in copper(II) sulfate pentahydrate. It begins with an introduction to hydrates, followed by setting up the experiment apparatus. The process of heating the hydrate is demonstrated, highlighting safety precautions and observable changes. After heating, the sample is cooled, and calculations are performed to determine the water content. The tutorial concludes with final measurements and a discussion on comparing experimental and theoretical results.

What is the main objective of the laboratory experiment discussed in the video?

• To measure the temperature of a Bunsen burner

• To calculate the density of copper

• To determine the color of copper(II) sulfate pentahydrate

• To find the percentage of water in a hydrate

How many water molecules are present in copper(II) sulfate pentahydrate?

• Six

• Five

• Four

• Three

What is the initial mass of the crucible recorded in the experiment?

• 12.51 g

• 12.70 g

• 13.00 g

• 11.50 g

Why is it important to use a clay triangle in the heating setup?

• To measure the temperature

• To stabilize the crucible during heating

• To add color to the flame

• To cool down the crucible

What noticeable change occurs to the copper(II) sulfate pentahydrate during heating?

• It emits a strong odor

• It turns white and crumbles

• It becomes liquid

• It turns blue

What is the molecular weight of water used in the calculations?

• 22.04

• 18.02

• 20.00

• 16.00

What is the purpose of heating the hydrate a second time?

• To increase its mass

• To make it more reactive

• To change its color

• To ensure all water is removed

What is the theoretical percentage of water in copper(II) sulfate pentahydrate?

• 50%

• 25%

• 40%

• 36%

What should be done if the crucible is still hot after heating?

• Touch it to check the temperature

• Wait for it to cool before weighing

• Cool it down with water

• Place it immediately on the balance

What is the atomic mass of copper used in the calculations?

• 63.5

• 32.07

• 16.00

• 64.0