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Plaster of paris is...

Plaster of paris is

A

`CaSO_(4).(1)/(2)H_(2)O`

B

`CaSO_(4).2H_(2)O`

C

`CaSO_(4).CaCO_(3)`

D

`CaSO_(4).5H_(2)O`

Text Solution

AI Generated Solution

The correct Answer is:
To answer the question "Plaster of Paris is," we will go through the following steps: ### Step 1: Identify the Chemical Composition Plaster of Paris is primarily composed of calcium sulfate. Specifically, it is a form of calcium sulfate that is partially hydrated. **Hint:** Look for the chemical formula that represents the hydrated form of calcium sulfate. ### Step 2: Understand the Hydration The chemical formula for gypsum, which is the precursor to plaster of Paris, is CaSO4·2H2O. When gypsum is heated, it loses water and converts to plaster of Paris. **Hint:** Remember the process of heating gypsum and how it affects the water content in the chemical formula. ### Step 3: Heating Process Plaster of Paris is produced by heating gypsum at around 150 degrees Celsius (or 423 Kelvin). This process is known as calcination. **Hint:** Consider the temperature range and the process that leads to the formation of plaster of Paris. ### Step 4: Final Chemical Formula After heating gypsum, the resulting compound is CaSO4·1.5H2O. This indicates that plaster of Paris contains one and a half molecules of water per molecule of calcium sulfate. **Hint:** Focus on how the water content changes from gypsum to plaster of Paris. ### Step 5: Applications Plaster of Paris is widely used in various applications, including sculpting and making gauze bandages, due to its quick-setting properties. **Hint:** Think about the practical uses of plaster of Paris in everyday life. ### Conclusion Based on the above steps, we conclude that plaster of Paris is a white powdery chemical compound with the formula CaSO4·1.5H2O, obtained by heating gypsum. **Final Answer:** Plaster of Paris is CaSO4·1.5H2O.
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