Home
Class 11
CHEMISTRY
Find moles of NH(4)Cl required to preven...

Find moles of `NH_(4)Cl` required to prevent `Mg(OH)_(2)` from precipitating in a litre of solution which contains 0.02 mole `NH_(3)` and 0.001 mole `Mg^(2+)` ions.
Given : `K_(b)(NH_(3))=10^(-5),` `K_(sp)[Mg(OH)_(2)]=10^(-11)`.

A

`10^(-4)`

B

`2 xx 10^(-3)`

C

`0.02`

D

`0.1`

Text Solution

Verified by Experts

The correct Answer is:
B
`[OH^(-)]= sqrt((K_(SP))/([Mg^(2+)])) = sqrt((10^(-11))/(10^(-3))) = 10^(-4)`
`rArr pOH = pK_(b) + "log" ([NH_(4)Cl])/([NH_(3)])`
Promotional Banner

Topper's Solved these Questions

  • IONIC EQUILIBRIUM

    NARAYNA|Exercise Level-VI (H.W)|35 Videos

  • IONIC EQUILIBRIUM

    NARAYNA|Exercise Level-II (H.W)|51 Videos

  • HYDROGEN & ITS COMPOUNDS

    NARAYNA|Exercise LEVEL-4|21 Videos

  • PERIODIC TABLE

    NARAYNA|Exercise All Questions|568 Videos

Similar Questions

Explore conceptually related problems

Calculate [overset(o+)NH_(4)] (derived from NH_(4)C1) needed to prevent Mg(OH)_(2) from precipitating is 1.0L of solution which contins 0.01mol NH_(3) and 0.001 mol Mg^(2+). K_(sp) Mg(OH)_(2) = 1.2 xx 10^(-11), K_(b) NH_(3) = 1.8 xx 10^(-5) .

How many millimoles of MgCI_(2) should be added to just precipitate Mg(OH) in 500 ml buffer solution containing 0.1 M NH_(4)OH and 0.1M(NH_(4))_(2)SO_(4) ? {Given : K_(b) (NH_(4)OH) = 10^(-5), K_(sp) [Mg(OH)_(2)] = 10^(-11)}

Which of the following concentration of NH_(4)^(+) will be sufficient to present the precipitation of Mg(OH)_(2) form a solution which is 0.01 M MgCl_(2) and 0.1 M NH_(3)(aq) . Given that K_(sp)Mg(OH)_(2)=2.5xx10^(-11) and K_(b) for NH_(3) = 2xx10^(-5) .

Calculate the pH of a buffer solution containing 0.2 mole of NH_4Cl and 0.1 mole of NH_4OH per litre. K_b for NH_4OH=1.85xx10^(-5) .

The maximum pH of a solution which is having 0.10M in Mg^(2+) and from which Mg(OH)_(2) is not precipated is: (Given K_(sp)Mg)(OH)_(2)=4xx10^(11)M^(3)){log2=0.30}

The pK_(a) value of NH_(3) is 5. Calculate the pH of the buffer solution, 1 L of which contains 0.01 M NH_(4)Cl and 0.10M NH_(4)OH :

NARAYNA-IONIC EQUILIBRIUM-Level-V (H.W)
  1. In a saturated solution of AgCl, NaCl is added gradually. The concentr...

    Text Solution

    |

  2. During the titration of a weak diprotic acid (H(2)A) against a strong ...

    Text Solution

    |

  3. Find moles of NH(4)Cl required to prevent Mg(OH)(2) from precipitating...

    Text Solution

    |

  4. A certain indicator (an organic dye) has pK(a)=5. For which of the fol...

    Text Solution

    |

  5. 50 ml of 0.05 M Na(2)CO(3) is titrated against 0.1 M HCl. On adding 40...

    Text Solution

    |

  6. Equilibrium constants of T(2)O (T or (1)^(3)H is an isotope " of "(1)^...

    Text Solution

    |

  7. The ionisation constant of an acid base indicator is 3' 10^(-5). The a...

    Text Solution

    |

  8. 20 mL of 0.1 M weak acid HA(K(a)=10^(-5)) is mixed with solution of 10...

    Text Solution

    |

  9. Calculate the ratio of [HXOO^(-)] and [F^(-)] in a mixture of 0.2 M HC...

    Text Solution

    |

  10. If first dissociation of X(OH)(32) is 100% where as second dissociatio...

    Text Solution

    |

  11. H(3)A is a weak triprotic acid (K(a1)=10^(-5),K(a2)=10^(-9),K(a3)=10^(...

    Text Solution

    |

  12. A solution cotaning 0.10 M in Ba(NO(3))(2) and 0.10 M in Sr(NO(3))(2)....

    Text Solution

    |

  13. A solution is 0.01 M Kl and 0.1 M KCl. If solid AgNO(3) is added to th...

    Text Solution

    |

  14. What is maximum pH required to prevent the precipitation of ZnS in a s...

    Text Solution

    |

  15. Which of the following statements is correct for a solution saturated ...

    Text Solution

    |

  16. A solution contians 0.1 M NaCl, 0.01 M NaBr and 0.001 M Nal.solid AgNO...

    Text Solution

    |

  17. Choose the correct statement/s:

    Text Solution

    |

  18. If you have a saturated solution of CaF(2), then

    Text Solution

    |

  19. If concentration of two weak acids are C(1) and C(2) "mol"//L and degr...

    Text Solution

    |

  20. If K(a(1)),K(a(2)) are the first, second and third ionization constant...

    Text Solution

    |