Understanding Phosphoric Acid Properties

The video explains the behavior of phosphoric acid (H3PO4) in water, highlighting its nature as a weak acid. It discusses the stepwise dissociation of H3PO4 into H2PO4-, HPO4^2-, and PO4^3- ions, emphasizing the equilibrium state due to incomplete dissociation. The video also covers the concept of aqueous ions and the formation of hydronium (H3O+) from H+ ions in water. The tutorial concludes with a recap of the dissociation process and the equilibrium setup.

What is the chemical formula for phosphoric acid?

• H2SO4

• H3PO4

• HNO3

• HCl

Why is H3PO4 considered a weak acid?

• It completely dissociates in water.

• It is not an acid.

• It partially dissociates in water.

• It does not dissociate at all.

What symbol is used to represent equilibrium in chemical equations?

• <=>

• =

• <-

• ->

Which of the following is the easiest hydrogen to lose from H3PO4?

• None of them

• The second hydrogen

• The third hydrogen

• The first hydrogen

What does the presence of an equilibrium symbol in a reaction indicate?

• The reaction is reversible.

• The reaction goes to completion.

• The reaction is instantaneous.

• The reaction does not occur.

Which ion is formed when H+ joins with a water molecule?

• H3O+

• H2O

• PO4^3-

• OH-

What is the state of ions in water?

• Aqueous

• Gas

• Liquid

• Solid

What is the final ion formed when H3PO4 loses all its hydrogen ions?

• PO4^3-

• HPO4^2-

• H2PO4-

• H3O+

What is the charge on the phosphate ion (PO4) after complete dissociation?

• -1

• 0

• -2

• -3

Which of the following is not a product of H3PO4 dissociation?

• H2PO4-

• HPO4^2-

• H3O+

• NaCl