Lead(II) Phosphate and Solubility Concepts

The video tutorial explains the reaction between lead(II) phosphate and water. It begins by introducing the compounds and questioning whether lead(II) phosphate dissolves in water. The solubility rules are discussed, revealing that lead(II) phosphate is mostly insoluble, with only a small amount dissolving. The video then provides the equation for this minor dissolution. Finally, it concludes that the majority of lead(II) phosphate remains solid in water, settling at the bottom of the test tube.

What is the chemical formula for lead(II) phosphate?

• Pb3(PO4)2

• Pb2(PO4)3

• Pb(PO4)2

• Pb3(PO3)2

What is the state of water when mixed with lead(II) phosphate in the experiment?

• Plasma

• Gas

• Liquid

• Solid

According to solubility rules, how do most phosphates behave in water?

• They react vigorously

• They are insoluble with few exceptions

• They evaporate

• They are highly soluble

What happens to lead(II) phosphate when it is placed in water?

• It reacts with water to form a new compound

• It evaporates

• It dissolves completely

• It remains a solid and falls to the bottom

What does 'insoluble' mean in the context of lead(II) phosphate in water?

• It dissolves completely

• It does not dissolve at all

• Almost none of it dissolves

• It reacts with water

What is the charge on the phosphate ion in the dissolved state?

• 2-

• 4-

• 3-

• 1-

How many lead ions are present in the dissolved ionic equation?

• 1

• 4

• 2

• 3

What does 'aq' stand for in the chemical equation?

• Aqueous, meaning gas in water

• Aqueous, meaning liquid in water

• Aqueous, meaning solid in water

• Aqueous, meaning dissolved in water

Where can the water (H2O) sometimes be written in the chemical equation?

• Below the arrow

• Above the arrow

• Next to the reactants

• Next to the products

What is the final state of lead(II) phosphate after being mixed with water?

• It becomes a gas

• It dissolves completely

• It remains a wet solid

• It forms a new compound