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pH of a saturated solution fo magnesium ...

pH of a saturated solution fo magnesium hydroxide in water at `298K` is 10. The solubility of the hydroxide in water at 298 K is

A

`5xx10^(-5)molL^(-1)`

B

`5xx10^(-12)molL^(-1)`

C

`1xx10^(-4)molL^(-1)`

D

`1xx10^(-10)molL^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
A
`Mg(OH)_(2)iffMg^(2+)+2OH^(-)`
pH of `Mg(OH)_(2)` solution is 10
`becausepOH=4`
So `[OH^(-)]=10^(-4)`
`[OH^(-)]=2xx"solubility"`
`because "solubility"=(10^(-4))/(2)=0.5xx10^(-4)=5xx10^(-5)molL^(-1)`
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2.5 g of a solute are dissolved in 25 g of water to form a saturated solution at 298 K. Find out the solubility of the solute at this temperature. What mass of potassium chloride would be needed to form a saturated solution in 50 g of water at 298 K? Given that solubility of the salt is 46/100 g at this temperature.

Knowledge Check

  • What is the pH of a saturated solution of magnesium hydroxide, Mg(OH)_(2) at 25^(@) C)

    A
    10.56
    B
    10.36
    C
    10.26
    D
    10.05

  • Which of the following is least soluble in water at 298 K?

    A
    `CH_(3)NH_(2)`
    B
    `(CH_(3))_(3)N`
    C
    `(CH_(3))_(2)NH`
    D
    `C_(6)H_(5)NH_(2)`

  • The concentration of water molecules in pure water at 298 K is

    A
    `10^(-7)M`
    B
    `55.5M`
    C
    `5.55M`
    D
    `7.26M`

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