To determine what Plaster of Paris is, we can follow these steps:
### Step 1: Understand the Composition of Gypsum
- Gypsum is a hydrated form of calcium sulfate, represented as CaSO4.2H2O. This means it contains two water molecules for every calcium sulfate unit.
### Step 2: Heating Gypsum
- When gypsum (CaSO4.2H2O) is heated to about 125 degrees Celsius, it loses its water of crystallization. This process results in the formation of Plaster of Paris.
### Step 3: Identify the Chemical Formula of Plaster of Paris
- The heating of gypsum leads to the formation of calcium sulfate hemihydrate, which is represented as CaSO4.1/2H2O or CaSO4.H2O. This indicates that for every unit of calcium sulfate, there is half a water molecule associated with it.
### Step 4: Analyze the Given Options
- Now, we will look at the options provided:
1. CaSO4 (Calcium Sulfate)
2. CaSO4.7H2O (Calcium Sulfate Heptahydrate)
3. 2CaSO4.H2O (This represents two units of calcium sulfate with one water molecule)
4. CaSO4.2H2O (This is just gypsum)
### Step 5: Determine the Correct Option
- Since Plaster of Paris is CaSO4.H2O and none of the options directly state CaSO4.1/2H2O, we can see that option 3 (2CaSO4.H2O) is misleading as it suggests two units of calcium sulfate with one water molecule, which does not represent Plaster of Paris.
- The correct representation of Plaster of Paris, based on our understanding, is CaSO4.H2O, which is not explicitly listed. However, option 3 is the closest in terms of the water content.
### Conclusion
- Therefore, the correct answer is that Plaster of Paris is best represented by option 3, which can be interpreted as containing the essential components of Plaster of Paris.
S_(2) : Plaster of paris is a hemihydrate of calcium sulphate obtained by heating the gypsum above 393K . S_(2) : Sodium carbonate is used in water softening. S_(4) : The order of mobilities of the alkali metal ions in aqueous solutions is Li^(+)gtNa^(+)gtK^(+)gtRb^(+)gtCs^(+)
Give the chemical formula of the following: a. Plaster of paris, b. Asbestos, c. Hydrolith
Match the important chemical given in column (A) with the chemical fomulae given in Column (B). {:("Column (A), Column (B)"),("(a) Plaster of paris, (i)" Ca(OH)_(2)),("(b) Gypsum (ii)"CaSO_(4) .(1)/(2)H_(2)O),("(c) bleaching powder (iii)" CaSO_(4).2H_(2)O),("(d) Slaked lime (iv)"CaOCl_(2)):}
Write the chemical name of Plaster of Paris. Write the chemical equation of its preparation. Why should Plaster of Paris be stored in a dry place ?
Write an equation to show the reaction between Plaster of Paris and water
Write the chemical formulae of the following chemical compounds. Plaster of Paris and Slaked lime.
The composition formula of i) Gypsum : ii) plaster of paris : iii) Glauber's Salt:
Plaster of Paris should be stored in a moisture-proof container. Explain why?
Plaster of Paris on losing water and gaining water gives A and B . Identify A and B .
Plaster of paris when mixed with the correct amount of water sets into solid mass due to the formation of:
