Magnesium Carbonates Reaction Under Various Test?

In summary, when testing for Magnesium Carbonate using the Precipitation Test, Flame Test, Benedicts Reagents Test, and Dilute Acid Test, you would expect to see a positive result for the Precipitation Test due to the formation of a precipitate with calcium chloride. The Flame Test would produce no color as magnesium does not produce visible light. The Benedicts Reagent Test would result in a blue color due to the presence of magnesium chloride, which is not a simple sugar. Finally, the Dilute Acid Test would produce carbon dioxide gas, indicating a positive result.
  • #1
John Ker
16
1

Homework Statement


If you had a solution of Magnesium carbonate, what results would you expect from the following four tests: Precipitation Test, Flame Test, Benedicts Reagents Test, Dilute Acid Test.

Could someone take a look at my reasoning to how the Magnesium Carbonate would react under these conditions, thanks!

The Attempt at a Solution


[/B]
Precipitation Test:

MgCO3(aq)+CaCl2(aq) → MgCl2(aq) + CaCO3(s)

When Magnesium Carbonate reacts with Calcium Chloride, it will produce Magnesium Chloride and Calcium Carbonate, Calcium Carbonate is a precipitate in this case, hence the test will be positive. Flame Test:

When testing for metal ions within the solution, Mg, the metal, does not produce visible light within the spectrum, hence the test will produce no color when placed under the flame. Benedicts Reagent:

Magnesium Chloride is not a simple sugar, hence it will produce blue under both the room temperature and heated solutions. Dilute Acid Test:

MgCO3 à Mg+ + CO3-

2H+ + CO3 à H2O + CO2(g)

CO2 will rapidly form, giving a positive to the Dilute Acid Test.
 
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  • #2
John Ker said:
what results would you expect from the following four tests: Precipitation Test

Is it really how the question was worded? "Precipitation test" doesn't say anything about anion/cation added, so it can be either positive or negative, depending on what you use.

Other than that your logic looks OK (although I am not convinced about practicality of the calcium carbonate precipitation, magnesium carbonate is rather weakly soluble so the concentration of CO32- will be low, making the precipitation difficult to observe).
 

Related to Magnesium Carbonates Reaction Under Various Test?

1. What is the purpose of testing the reaction of magnesium carbonates under various conditions?

The purpose of testing the reaction of magnesium carbonates under various conditions is to understand how this compound behaves in different environments. This can help scientists determine its properties and potential uses in various industries.

2. What are the different conditions that can affect the reaction of magnesium carbonates?

Some of the conditions that can affect the reaction of magnesium carbonates include temperature, pressure, pH levels, and the presence of other substances. These factors can influence the speed and extent of the reaction, as well as the end products.

3. What are the potential applications of magnesium carbonates based on its reactions?

Magnesium carbonates have a wide range of potential applications based on their reactions. They can be used as an antacid to neutralize stomach acid, as a fire retardant in construction materials, and as a source of magnesium in fertilizers and animal feed. They are also being studied for their potential use in carbon capture and storage technologies.

4. How does the reaction of magnesium carbonates differ under acidic and alkaline conditions?

Under acidic conditions, magnesium carbonates tend to dissolve and release carbon dioxide gas. This reaction is known as effervescence and is commonly observed when magnesium carbonate is mixed with an acidic solution. Under alkaline conditions, magnesium carbonates are more stable and may form other compounds such as magnesium hydroxide.

5. What are some methods used to test the reaction of magnesium carbonates under various conditions?

There are several methods that scientists use to test the reaction of magnesium carbonates under various conditions. These include titration, which measures the amount of acid or base needed to neutralize the compound, and spectroscopy, which analyzes the absorption or emission of light by the compound. Other techniques such as X-ray diffraction and thermal analysis can also provide valuable information about the reaction process.

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