the chemical formula of POP is CaSO4.1/2H2O, How can H2O be (1/2) divided

Hi!

@Rane

Plaster of Paris has the actual formula 2CaSO4.H2O. For every 2 molecules of calcium sulphate, one molecule of water is present. CaSO4.1/2H2O is just a simplified way of writing.

@Anubhav

Hey, you got it correct. But I guess in haste you missed out the water of crystallisation present along with 2CaSO4 in POP.

But, this is a great answer. Keep it up!

 @Rahul

Good attempt!

The lines you wrote down are correct but it is not the exact answer to the question made by Rane.

So, let me make this clear for you.  

Plaster of Paris has the actual formula 2CaSO4.H2O. For every 2 molecules of calcium sulphate, one molecule of water is present. CaSO4.1/2H2O is just a simplified way of writing.

 Cheers!!

  • 0

The Actual formula of pop is 2CaSO4 that means for every 2 molecules of calcium sulphate is one molecle of water
and if this formula is further simplified we get CaSO4.1/2H2O

 

hope u got it if yes then thumbs up plzz...

  • 12

Plaster of Paris is a Calcium sulfate semi-hydrate (CaSO4, 1/2 H2O) derived from Gypsum, a calcium sulfate di-hydrate (CaSO4, 2H2O), by firing this mineral at relatively low temperature and thus reducing it to powder.
CaSO4.2H2O + HEAT -----------------> CaSO4.1/2 H2O + 1.5 H2O
and 1/2 H2O indicates that the semi hydrate form of CaSO4

  • -3

sonu u are wrong go through ur textbook.

  • 2
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