Sodium Carbonate and Hydrates Concepts

The video tutorial explains how to write the formula for sodium carbonate decahydrate. It begins by detailing the formula for sodium carbonate, highlighting the ionic charges involved. The tutorial then explains the concept of decahydrate, indicating the presence of ten water molecules. It concludes by differentiating between hydrated and anhydrous sodium carbonate.

What is the first step in writing the formula for sodium carbonate decahydrate?

• Find the atomic mass of sodium.

• Identify the number of water molecules.

• Write the formula for sodium carbonate.

• Determine the charge of sodium.

What is the symbol for sodium on the periodic table?

• S

• Na

• So

• Sn

Which of the following is a polyatomic ion?

• Cl

• O2

• Na

• CO3

What is the charge of the carbonate ion?

• 1+

• 2+

• 1-

• 2-

How do you balance the charges in sodium carbonate?

• Add more sodium ions.

• Ensure the net charge is zero.

• Add more carbonate ions.

• Increase the charge of sodium.

What does 'Deca' in decahydrate signify?

• 8

• 10

• 5

• 12

How is the presence of water molecules indicated in the formula of a hydrate?

• By a dot followed by the number of water molecules.

• By a slash.

• By a minus sign.

• By a plus sign.

What happens to sodium carbonate decahydrate when it is heated?

• It becomes a liquid.

• It forms anhydrous sodium carbonate.

• It changes color.

• It gains more water molecules.

What is the term for sodium carbonate without water molecules?

• Sodium carbonate dihydrate

• Sodium carbonate monohydrate

• Anhydrous sodium carbonate

• Hydrated sodium carbonate