Home
Class 12
CHEMISTRY
A weak acid, HA has a K(a) of 1.00xx10^(...

A weak acid, HA has a `K_(a)` of `1.00xx10^(-5)`. If 0.100 mol of this acid is dissolved in one litre of water, the percentage of acid dissociated at equilibrium is closest to :

A

`1.00%`

B

`99.9%`

C

`0.100%`

D

`99.0%`

Text Solution

Verified by Experts

The correct Answer is:
A
`alpha = sqrt((K_(a))/(c ))=sqrt((1.0xx10^(-5))/(10^(-1)))=10^(-2)`.
`therefore` Percentage of acid dissociated `=10^(-2)xx100`
`=1%`
Promotional Banner

Topper's Solved these Questions

  • EQUILIBRIUM

    MODERN PUBLICATION|Exercise Multiple Choice Questions (Level - II)|90 Videos

  • EQUILIBRIUM

    MODERN PUBLICATION|Exercise Multiple Choice Questions (Level - III)|13 Videos

  • ENVIROMENTAL POLLUTION

    MODERN PUBLICATION|Exercise RECENT EXAMINATION QUESTIOS|2 Videos

  • GENERAL PRINCIPLES AND PROCESSES OF ISOLATION OF ELEMENTS

    MODERN PUBLICATION|Exercise Recent Examination Questions|13 Videos

Similar Questions

Explore conceptually related problems

When 10^(-6) mole of a monobasic strong acid is dissolved in one litre of solvent, the pH of the solution is ..............

A 0.1 M solution of a weak acid HA is 1% dissociated. The approximate value of dissociation constant is :

A weak acid HX has the dissociation constant 1xx10^(-5)M . It forms a salt NaX on reaction with alkali. The percentage hydrolysis of 0.1 M solution of NaX is :

The pH of a 0.1 molar solution of the acid HQ is 3. The value of the ionization constant, K_(a) of this acid is :

What is dissociation constant of a weak acid (K_(a)) .

MODERN PUBLICATION-EQUILIBRIUM-Recent Examination Questions
  1. A weak acid, HA has a K(a) of 1.00xx10^(-5). If 0.100 mol of this acid...

    Text Solution

    |

  2. Consider the following gaseous equilibria with equilibrium constants K...

    Text Solution

    |

  3. 0.023g of sodium metal is reacted with 100 cm^(3) of water. The pH of ...

    Text Solution

    |

  4. A buffer solution contains 0.1 mole of sodium acetate dissolved in 100...

    Text Solution

    |

  5. One dm^(3) solution containing 10^(-5) moles each of Cl^(-) ions and C...

    Text Solution

    |

  6. pH value of which one of the following is NOT equal to one ?

    Text Solution

    |

  7. The pH of the solution obtained by mixing 100 mL of a solution of pH =...

    Text Solution

    |

  8. The equilibrium constant of the reaction : A((s))+2B((aq))^(+)hArr...

    Text Solution

    |

  9. The equilibrium constant of a reaction is 0.008 at 298 K. The standard...

    Text Solution

    |

  10. 5 mL of 0.4N NaOH is mixed with 20 mL of 0.1N HCl. The pH of the resul...

    Text Solution

    |

  11. On adding which of the following the pH of 20 mL of 0.1 N HCl will not...

    Text Solution

    |

  12. The yield of the products in the reaction, A(2(g))+2B((g))hArr C((...

    Text Solution

    |

  13. The conjugate base of H(2)PO(4)^(-) is :

    Text Solution

    |

  14. Identify a species which is 'NOT' a Bronsted acid but a Lewis acid.

    Text Solution

    |

  15. The pH of 10^(-8) M HCl solution is :

    Text Solution

    |

  16. An example for a neutral buffer is :

    Text Solution

    |

  17. For the equilibrium: CaCO(3(s)) iff CaO((s)) + CO(2(g)) , Kp = 1.64 at...

    Text Solution

    |

  18. The number of H^(+) ions present in 1 ml of a solution whose pH is 13 ...

    Text Solution

    |