Solubility of Calcium Phosphate

The video explores whether calcium phosphate (Ca3(PO4)2) is soluble in water. It begins by identifying calcium phosphate as an ionic compound and discusses its potential to dissociate in water. The video then examines solubility rules, noting that most phosphates are insoluble except for those with group 1 elements and ammonium. Calcium is not an exception, so calcium phosphate is deemed insoluble. A solubility chart is used to confirm this finding, showing that calcium phosphate remains a solid in water. The video concludes by reiterating that calcium phosphate is insoluble, with only a negligible amount dissolving.

What type of compound is calcium phosphate?

• Molecular

• Covalent

• Ionic

• Metallic

According to solubility rules, which group of elements generally forms soluble phosphates?

• Noble gases

• Group 1 elements

• Transition metals

• Group 2 elements

Why is calcium phosphate considered insoluble in water based on solubility rules?

• It is a covalent compound

• It reacts with water to form a new compound

• It forms a gas when dissolved

• It does not fall under the exceptions for soluble phosphates

What does the solubility chart indicate about calcium phosphate?

• It is highly soluble

• It is slightly soluble

• It forms a precipitate

• It is insoluble

How does the solubility chart confirm the solubility rules for calcium phosphate?

• It does not list calcium phosphate

• It shows calcium phosphate as a gas

• It shows calcium phosphate as insoluble

• It shows calcium phosphate as soluble

What happens to calcium phosphate when placed in water?

• It reacts violently

• It dissolves completely

• It remains mostly solid

• It forms a gas

What is noted about the small amount of calcium phosphate that might dissolve in water?

• It changes the color of the solution

• It forms a new compound

• It is negligible and can be ignored

• It is significant and should be considered

What is the final conclusion about the solubility of calcium phosphate in water?

• It is insoluble

• It is soluble

• It is reactive

• It is volatile