Home
Class 12
CHEMISTRY
The freezing point depression of a 0.1 M...

The freezing point depression of a 0.1 M aq. Solution of weak acid (HX) is `-0.20^(@)"C".` What is the value of equilibrium constant for the reaction:
`"HX(aq)"iff"H"^(+)"(aq)"+"X"^(-1)"(aq)"`
[Given: `"K"_("f")" for water=1.8 Kg mol"^(-1)"K. & Molality=Molarity"`]

A

`1.46xx10^(-4)`

B

`1.35xx10^(-3)`

C

`1.21xx10^(-2)`

D

`1.35xx10^(-4)`

Text Solution

Verified by Experts

The correct Answer is:
B
`{:(,HX("aq"),1H^(+)(aq),+, X^(-)(aq)),(t=0,0.1M,0,,0),("At equilibrium",(0.1-"x"),"x",,"x"):}`
`Delta"T"_("f")=(0.1+"x")xx"K"_("b")`
` 0.20=(0.1+"x")xx1.8`
`"K"=("x"xx"x")/((0.1-"x"))=(0.011xx0.011)/((0.1-0.011))`
`"K"=1.35xx10^(-3)`
Promotional Banner

Topper's Solved these Questions

Similar Questions

Explore conceptually related problems

The freezing point depression of a 0.109M aq. Solution of formic acid is -0.21^(@)C . Calculate the equilibrium constant for the reaction, HCOOH (aq) hArr H^(+)(aq) +HCOO^(Theta)(aq) K_(f) for water = 1.86 kg mol^(-1)K

The freezing pont depression of a -0.2046^(@) C . What is the equlibrium constant for the reaction at 298 K ? HCOO^(-)(aq) + H_(2) O(l)iffHCOOH(aq) + OH^(-) (aq) (Given : K_(f) (H_(2)O)=1.86 K kg mol^(-) , " Molartiy = molality")

Calculate pOH of 0.1 M aq. Solution of weak base BOH (K_(b)=10^(-7)) at 25^(@)C.

What is the osmotic pressure of 0.2 M HX (aq.) solution at 300 K ?

A 0.2 molar aqueous solution of a weak acid (HX) is 20% ionised . The freezing point of the solution is: (Given: K_(f)=1.86^(@) C kg" "mol^(-1)" for water")

Determine the values of equilibrium constant (K_(c)) and DeltaG^(@) for the reaction Ni(s)+2Ag^(+)(aq)rarrNi^(2+)(aq)+2Ag(s), E^(@)=1.05 V. ( "Given " 1F=96500"C mol"^(-1))

If the freezing point of 0.1 M HA(aq) solution is -0.2046^(@)C then pH of solution is ( If K_(f) water =1.86mol^(-1)kg^(-1))

The freezing point of an aqueous solutions is 272 .93 K . Calculate the molality of the solution if molal depression constant for water is 1.86 Kg mol^(-1)

BANSAL-SOLUTIONS-Exercise 1
  1. The Van't Hoff factor for a dillute aqueous solution of glucose is

    Text Solution

    |

  2. The correct relationship between the boiling point f very dilute solut...

    Text Solution

    |

  3. The vapour pressure of a solution of a non-volatile electrolyte B in a...

    Text Solution

    |

  4. At a given temperature , total vapour pressure (in Torr) of a mixture ...

    Text Solution

    |

  5. Assuming each salt to be 90% dissociated which of the following will h...

    Text Solution

    |

  6. The vapour pressure of a solvent decreased by 10 mm of Hg when a non-v...

    Text Solution

    |

  7. Elevation of boiling point of 1 molar aqueous glucose solution ("densi...

    Text Solution

    |

  8. What will be the molecular weight of "CaCl"(2) determined in its aq. S...

    Text Solution

    |

  9. 1.0 molal aqueous solution of an electrolyte "A"(2)"B"(3) is 60% ionis...

    Text Solution

    |

  10. Which of the following plots represents an ideal binary mixture?

    Text Solution

    |

  11. Two liquid A & B form an ideal solution. What is the vapour pressure o...

    Text Solution

    |

  12. Which of the following represents correcty the changes in thermodynami...

    Text Solution

    |

  13. FeCI(3) on reaction with K(4)[Fe(CN)(6)] in aqueous solution gives blu...

    Text Solution

    |

  14. A liquid mixture ohaving composition corresponding to point Z in the f...

    Text Solution

    |

  15. The vapour pressure of a saturated solution of sparingly soluble salt ...

    Text Solution

    |

  16. At 300K, the vapour pressure of an ideal solution containing 3 mole of...

    Text Solution

    |

  17. The following graph represents variation of boiling point with composi...

    Text Solution

    |

  18. The freezing point depression of a 0.1 M aq. Solution of weak acid (HX...

    Text Solution

    |

  19. The vapour pressure of an aqueous solution is found to be 750 torr at...

    Text Solution

    |

  20. The following graph represents variation of vapour pressre with compos...

    Text Solution

    |