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A mixture of 100m mol of Ca(OH)(2) and ...

A mixture of 100m mol of `Ca(OH)_(2)` and 2g of sodium sulphate was dissolved in water and the volume was made up to 100 mL. The mass of calcium sulphate formed and the concentration of `OH^(-)` in resulting solution, respectively, are: (Molar mass of `Ca(OH)_(2),Na_(2)SO_(4)` and `CaSO_(4)` are 74, 143 and 136 g `mol^(-1)` respectively, `K_(sp)` of `Ca(OH)_(2)` is `5.5xx10^(-6)` )

A

13.6 g, 0.14 `"mol L^(-1)`

B

13.6 g, `0.28 "mol"L^(-1)`

C

`1.9 g, 0.28 "mol L"^(-1)`

D

`1.9 g, 0.14 "mol L"^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
C
`underset(100 "m mol")(Ca(OH)_(2)) + underset(2000/142)(Na_(2)SO_(4)) to CaSO_(4) + 2OH^(-)`
`= 13.986 = 14` mili mol
mass of `CaSO_(4) = (14 xx 136)/1000 = 1.9 g`
`[OH^(-)] = 28/100 = 0.28 M`
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Knowledge Check

  • A mixture of 200 mmol of Ca(OH)_2 and 3g of sodium sulphate was dissolved in water and the volume was made up to 200 mL. The mass of calcium sulphate formed and the concentration of OH^(-) in resulting solution, respectively, are: (Molar mass of Ca(OH)_2 , Na_2SO_4 " and " CaSO_4 are 74, 143 and 136 g mol^(-1) respectively, K_(sp) of Ca (OH)_2 is 5 xx 10^(-6) )

    A
    `2.9 gm 0.21 mol L^(-1)`
    B
    `13.6 gm , 0.21 mol L^(-1)`
    C
    `2.9 gm , 0.11 mol L^(-1)`
    D
    `13.6 gm , 0.11 molL^(-1)`

  • A mixture of 2g of sodium sulphate and 100 m mol of Ca(OH)_2 was dissolved in water and the volume was made up to 100mL. What are the mass of calcium sulphate formed and the concentration of OH^(-) in resulting solution, respectively ? Given:- (Molar mass of Ca(OH)_2, Na_2SO_4 and CaSO_4 are 74, 143 and 136 "g mol"^(-1) , respectively, K_(sp) of Ca(OH)_(2) is 5.5 xx 10^(-6)

    A
    1.9 g `0.14 "mol L"^(-1)`
    B
    `13.6` g, `0.28 "mol L"^(-1)`
    C
    `1.9 g, 0.28 "mol L"^(-1)`
    D
    `13.6, 0.14 "mol L"^(-1)`

  • 5.0 g of sodium hydroxide (molar mass 40 g mol) is dissolved in little quantity of water and the solution is diluted upto 100 mL. What is the molarity of the resulting solution?

    A
    `0.1" mol dm"^-3`
    B
    `1.0" mol dm"^-3`
    C
    `0.125" mol dm"^-3`
    D
    ` 1.25" mol dm"^-3`