Preparation of calcium sulphate.
Calcium sulphate is a slightly soluble solid that is used to make plaster. Prepare the solid. Mix solutions well_the reaction may be slow to occur. Use this information and answer the following questions.
1. Method
2. Balance equation
3. Net ionic equation
4. Observations
5. What properties of calcium sulphate make it suitable for use in plaster?
1. Method: Mix a solution of calcium chloride (CaCl2) with a solution of sodium sulphate (Na2SO4) and allow the reaction to occur. Filter and wash the resulting precipitate to obtain calcium sulphate (CaSO4).
2. Balance equation:
CaCl2 + Na2SO4 → CaSO4 + 2NaCl
3. Net ionic equation:
Ca2+ + SO42- → CaSO4(s)
4. Observations: Initially, mixing the solutions will result in no visible change. However, after a few minutes, a white precipitate will start to form. This precipitate will continue to grow until the reaction is complete. Filtration and washing of the precipitate will result in a white solid which is calcium sulphate.
5. Properties of calcium sulphate that make it suitable for use in plaster:
- Calcium sulphate has good binding properties which make it effective in holding together particles of other materials in a solid mass.
- It has a moderately high compressive strength which allows it to withstand weight and pressure without breaking.
- It is fire-resistant and non-toxic, making it safe for use in construction and medical applications.
- It is easy to work with and can be shaped and molded into different forms to suit a variety of needs.
Preparation of barium sulphate.
Barium sulphate is an insoluble solid used as a paint pigment and in the barium meal taken for certaintypes of x ray photography. Prepare the sloid. Use this information and answer the questions.
1. Method
2. Balance equation
3. Net ionic equation
4. Observations
Preparation of barium sulphate.
Barium sulphate is an insoluble solid used as a paint pigment and in the barium metal taken for certaintypes of x ray photography. Prepare the sloid. Use this information and answer the questions.
1. Method
2. Balance equation
3. Net ionic equation
4. Observations
5. What properties of calcium sulphate make it suitable for use in
barium metal taken for x-ray photography?
1. Method: Mix a solution of barium chloride (BaCl2) with a solution of sodium sulphate (Na2SO4) and allow the reaction to occur. Filter and wash the resulting precipitate to obtain barium sulphate (BaSO4).
2. Balance equation:
BaCl2 + Na2SO4 → BaSO4 + 2NaCl
3. Net ionic equation:
Ba2+ + SO42- → BaSO4(s)
4. Observations: Initially, mixing the solutions will result in no visible change. However, after a few minutes, a white precipitate will start to form. This precipitate will continue to grow until the reaction is complete. Filtration and washing of the precipitate will result in a white solid which is barium sulphate.
5. Properties of barium sulfate that make it suitable for use in x-ray photography:
- Barium sulphate is radiopaque, meaning it blocks x-rays from passing through it, making it useful as a contrast agent in certain types of x-ray imaging.
- It is inert and non-toxic, making it safe to ingest in small amounts as a contrast agent for gastrointestinal tract imaging.
- It has a high melting point and is stable at high temperatures, making it useful in high-temperature applications such as ceramic manufacturing.
1. Method: Mix a solution of barium chloride (BaCl2) with a solution of sodium sulphate (Na2SO4) and allow the reaction to occur. Filter and wash the resulting precipitate to obtain barium sulphate (BaSO4).
2. Balance equation:
BaCl2 + Na2SO4 → BaSO4 + 2NaCl
3. Net ionic equation:
Ba2+ + SO42- → BaSO4(s)
4. Observations: Initially, mixing the solutions will result in no visible change. However, after a few minutes, a white precipitate will start to form. This precipitate will continue to grow until the reaction is complete. Filtration and washing of the precipitate will result in a white solid which is barium sulphate.
1. Method:
To prepare calcium sulfate, you would start with solutions of calcium chloride (CaCl2) and sodium sulfate (Na2SO4). The two solutions are mixed together and allowed to react, resulting in the formation of calcium sulfate (CaSO4) as a solid precipitate. The reaction is as follows:
CaCl2 + Na2SO4 → CaSO4 + 2NaCl
2. Balance equation:
The balanced chemical equation for the reaction is:
CaCl2 + Na2SO4 → CaSO4 + 2NaCl
3. Net ionic equation:
The net ionic equation, which shows only the species involved in the reaction, is:
Ca2+ + SO42- → CaSO4
4. Observations:
During the reaction, you would observe the formation of a white solid precipitate of calcium sulfate. This solid will settle at the bottom of the container or form as solid particles in the solution.
5. Properties of calcium sulfate suitable for use in plaster:
Calcium sulfate is suitable for use in plaster due to its properties, such as:
- Slightly soluble: Calcium sulfate has low solubility in water, allowing it to form a solid and create a plaster paste when mixed with water. This quality enables the plaster to solidify and harden over time, making it an excellent material for construction purposes.
- Quick setting: Calcium sulfate has the ability to set rapidly when mixed with water, allowing the plaster to harden and form a solid structure relatively quickly. This property is particularly favorable for applications such as making molds or casts.
- Compressive strength: Once calcium sulfate plaster has set and cured, it exhibits good compressive strength, making it suitable for supporting weight and load-bearing applications.
- Fire resistance: Calcium sulfate decomposes at high temperatures, releasing water vapor and acting as a fire retardant. This inherent fire resistance makes it a preferred material for fireproofing applications.
Overall, the combination of its solubility, quick setting, strength, and fire resistance properties make calcium sulfate an ideal choice for plaster in various construction and art-related applications.
1. Method: To prepare calcium sulphate, you will need to mix solutions of calcium chloride (CaCl2) and sodium sulphate (Na2SO4).
2. Balance equation:
CaCl2 + Na2SO4 → CaSO4 + 2NaCl
3. Net ionic equation:
As calcium chloride and sodium sulphate are both strong electrolytes, they ionize completely. Therefore, the net ionic equation for the reaction would be:
Ca^2+ + SO4^2- → CaSO4
4. Observations:
When you mix the solutions of calcium chloride and sodium sulphate, a white precipitate of calcium sulphate will form. You can observe the formation of the white solid, indicating the reaction has occurred.
5. Properties of calcium sulphate that make it suitable for use in plaster:
- Calcium sulphate is a slightly soluble solid, which means it can be easily mixed with water to form a workable paste for plastering walls or molds.
- When mixed with water, calcium sulphate undergoes a reaction called hydration, which results in the formation of a hard, solid material. This property allows the plaster to dry and harden quickly, creating a strong and durable surface.
- Calcium sulphate has good adhesion properties, allowing it to bond well with different materials like wood, concrete, or metal.
- The white color of calcium sulphate makes it visually appealing when used for plastering walls or creating decorative elements.
- Calcium sulphate is also fire-resistant, making it a safe choice for applications where fire protection is important.