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Chemistry of Magnesium and Potassium

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Questions and Answers

What is the role of ammonium salts in the formation of magnesium carbonate?

They have no effect on the formation of magnesium carbonate

They enhance the formation of magnesium carbonate

They react with magnesium ions to form a different compound

They prevent the formation of magnesium carbonate by shifting the equilibrium towards the formation of hydrogen carbonate ions (correct)

What is the precipitate formed when magnesium ions react with aqueous ammonia?

Magnesium phosphate

White gelatinous magnesium hydroxide (correct)

Magnesium carbonate

Basic magnesium carbonate

What is the purpose of removing ammonium ions from the mixture before testing for Na+, K+, and Mg2+?

To prevent interference with the precipitation of magnesium carbonate (correct)

To decrease the pH of the solution

To increase the concentration of magnesium ions

To enhance the precipitation of magnesium hydroxide

What is the compound formed when magnesium ions react with sodium carbonate in the absence of ammonium salts?

Basic magnesium carbonate Signup and view all the answers

What is the characteristic precipitate formed when magnesium ions react with sodium monohydrogen phosphate (disodium hydrogen phosphate) in an ammonia-ammonium chloride buffer?

White crystalline magnesium ammonium phosphate Signup and view all the answers

What is the reaction that occurs when magnesium ions react with sodium monohydrogen phosphate in a neutral solution?

Mg2+ + Na2HPO4 → MgHPO4 (s) Signup and view all the answers

What is the formula of the compound formed when magnesium ions react with sodium hydroxide?

Mg(OH)2 Signup and view all the answers

What is the test used to detect magnesium ions?

Magneson I test Signup and view all the answers

What is the compound formed when magnesium ions react with sodium monohydrogen phosphate in a strongly alkaline solution?

Mg3(PO4)2 Signup and view all the answers

What is the effect of ammonium salts on the formation of magnesium phosphate?

They enhance the formation of magnesium phosphate Signup and view all the answers