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Plaster of Paris should be stored in a m...

Plaster of Paris should be stored in a moisture-proof container. Explain why?

Text Solution

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Plaster of Paris is a white powder and on mixing with water , it changes to gypsum giving a hard solid mass.
`CaSO_(4).(1)/2H_(2)O+1(1)/(2)H_(2)O rarrunderset("Gypsum")(CaSO_(4).2H_(2)O)`
Hence, it should be stored in a moisture - proof container.
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(a) What are the common names of . (a) CaOCl_(2) , and (b) Na_(2)CO_(3)10H_(2)O ? (b) Why should plaster of Paris be stored in a moisture-proof container? (c) Explain why, while diluting a concentrated acid, acid should be added to water and not water to the acid.

(a). What is plaster of paris? Write the chemical formula of plaster of paris. (b) How is plaster of paris prepared? Write chemical equation of the reaction involved. (c) Explain why plaster of paris should be stored in a moisture-proof container. (d) State two important uses of plaster of paris.

Knowledge Check

  • Plaster of Paris is

    A
    `Ca SO _(4) . 2 H _(2) O`
    B
    `Ca SO _(4) . (1)/(2) H _(2)O`
    C
    `CaSO _(4) . 5 H _(2) O`
    D
    `CaSO _(4) . H _(2) O`

  • Plaster of Paris is

    A
    calcium sulphate `(CaSO_(4))`
    B
    calcium sulphate hemihydrate`(CaSO_(4).1//2H_(2)O)`
    C
    barium sulphate `(BaSO_(4))`
    D
    none of these .

  • 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`

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