Balancing Chemical Equations Concepts

In this video, Dr. B demonstrates how to balance the chemical equation Na2CO3 + H3PO4. The process involves counting atoms on both sides of the equation, recognizing the phosphate ion as a polyatomic ion, and making adjustments to balance sodium, phosphate, carbon, oxygen, and hydrogen atoms. The key step is ensuring an even number of sodium atoms, which facilitates balancing the rest of the equation. The video concludes with a balanced equation and a recap of the balancing strategy.

What is the initial count of sodium atoms on the reactant side?

• 1

• 2

• 3

• 4

How is the phosphate ion treated during the balancing process?

• As separate atoms

• Ignored

• As a single unit

• As a compound

What coefficient is placed in front of Na3PO4 to balance sodium atoms?

• 1

• 2

• 3

• 4

How many carbon atoms are present on the product side after balancing?

• 1

• 3

• 2

• 4

What is the total number of oxygen atoms on the reactant side after balancing?

• 7

• 6

• 8

• 9

What adjustment is made to balance hydrogen atoms?

• Decrease the coefficient of H3PO4

• Decrease the coefficient of Na2CO3

• Increase the coefficient of Na2CO3

• Increase the coefficient of H3PO4

What is the final count of oxygen atoms on both sides of the equation?

• 6

• 7

• 8

• 9

What was the key insight for balancing the equation?

• Balancing carbon first

• Balancing sodium to an even number

• Balancing hydrogen first

• Ignoring phosphate ions

What is the final balanced equation for sodium carbonate and phosphoric acid?

• Na2CO3 + H3PO4 → Na3PO4 + CO2 + H2O

• 2Na3PO4 + 3CO2 + 3H2O

• 3Na2CO3 + 2H3PO4 → 2Na3PO4 + 3CO2 + 3H2O

• Na2CO3 + H3PO4 → Na3PO4 + H2O

What is the role of Dr. B in the video?

• A teacher

• A narrator

• A student

• A chemist