Solubility of Magnesium Phosphate

The video discusses the solubility of magnesium phosphate (Mg3(PO4)2) in water, concluding that it is insoluble. This is determined through memorized solubility rules, a solubility chart, and practical testing. Most phosphates are insoluble, with magnesium phosphate being no exception. A solubility chart shows the interaction between magnesium ions and phosphate ions, confirming insolubility. Although a small amount may dissolve, it is negligible. The video suggests testing by adding magnesium phosphate to water to observe the result, reinforcing the conclusion.

What is the solubility status of magnesium phosphate in water?

• Insoluble

• Highly soluble

• Partially soluble

• Soluble

According to solubility rules, which of the following is true about phosphates?

• Most phosphates are insoluble with exceptions

• Phosphates are always soluble with magnesium

• Phosphates are never soluble

• All phosphates are soluble

What does the solubility chart indicate about magnesium phosphate?

• It is highly soluble

• It is insoluble

• It is partially soluble

• It is soluble in hot water

Where are the positive ions located on a solubility chart?

• In the center

• On the left

• On the right

• On the bottom

What is the charge of the magnesium ion in the solubility chart?

• Mg4+

• Mg3+

• Mg2+

• Mg+

What practical method can be used to test the solubility of magnesium phosphate?

• Putting it in water

• Mixing it with oil

• Heating it

• Freezing it

What is the expected outcome when magnesium phosphate is placed in water?

• It will change color

• It will react violently

• It will remain mostly undissolved

• It will dissolve completely