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Family of Salts

Why is POP wr...

Question

Why is POP written as CaSO4.1/2H2O? How is it possible to have half a water molecule attached to CaSO4?

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Solution

Half a molecule of water means that two units of a chemical substance share one molecule of water. In plaster of Paris, two units of calcium sulphate share one molecule of water, making it 1/2 molecule of water per CaSO₄ unit. This is why it is known as calcium sulphate hemihydrate and the chemical formula is CaSO₄.1/2H₂O.

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Similar questions

{CaSO}_{4} . \frac{1}{2} H_{2} O

In this Ca SO₄.1/2 (H₂O ) how a molecule of water can be divide into half?

C a S O_{4} \cdot 2 H_{2} O

C a S O_{4} \cdot \frac{1}{2} H_{2} O

C a S O_{4} \cdot 2 H_{2} O (s) \to C a S O_{4} \cdot \frac{1}{2} H_{2} O (s) + \frac{3}{2} H_{2} O (g)

Δ_{f} H^{⊖}

C a S O_{4} \cdot 2 H_{2} O (s), C a S O_{4} \frac{1}{2} H_{2} O (s), H_{2} O (g)

- 2021.0 k J m o l^{- 1}

- 1575.0 k J m o l^{- 1}

- 241.8 k J m o l^{- 1}

194.0

130.0

188.0 J K^{- 1} m o l^{- 1} .

R = 8.314 J K^{- 1} m o l^{- 1} = 0.0831 L b a r m o l^{- 1} K^{- 1}

1 K g

C a S O_{4} \cdot 2 H_{2} O (s)

^{- 1}

C a S O_{4} \cdot \frac{1}{2} H_{2} O (s)

$C a S O_{4} .2 H_{2} O Δ 120^{\circ} C - ----- \to A - - + 3 H_{2} O . A$ is

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