Home
Class 12
CHEMISTRY
The pH of 1 M PO(4)^(3-) (aq) solution i...

The pH of `1 M PO_(4)^(3-) (aq)` solution is,
[ Given `pK_(b)=(PO_(4)^(3-))=1.62]`

A

13.19

B

1.62

C

8.1

D

4.86

Text Solution

Verified by Experts

The correct Answer is:
A
`PO_(4)^(3-)+H_(2)O hArr HPO_(4)^(2-)+OH^(-)`
`[OH^(-)]=sqrt(K_(b)C)`

`pOH =(1)/(2)[pK_(b)-log C]`
`=(1)/(2)[1.62-log 1 ] =0.81`
`pH =14-pOH =14-0.81=13.19`
Promotional Banner

Topper's Solved these Questions

  • IONIC EQUILIBRIUM

    DINESH PUBLICATION|Exercise REVISION QUESTIONS FROM COMPETITVE EXAMS|236 Videos

  • IONIC EQUILIBRIUM

    DINESH PUBLICATION|Exercise SELECTED STRAIGHT OBJECTIVE TYPE MCQs|10 Videos

  • IONIC EQUILIBRIUM

    DINESH PUBLICATION|Exercise Buffer solutions / Salt Hydrolysis|29 Videos

  • HYDROCARBONS

    DINESH PUBLICATION|Exercise All Questions|493 Videos

  • NO IDEA

    DINESH PUBLICATION|Exercise Unit Test -|1 Videos

Similar Questions

Explore conceptually related problems

The pH of 1 M PO_(4)^(3-) (aq) solution (given pK_(b) of PO_(4)^(3-) = 2 ) is

When a salt reacts with water resulting into formation of acidic or basic solution, the process is referred to as salt hydrolysis. The pH of salt solution can be calculated using the following equations. pH = ( 1)/(2) ( p K_(w) + pK_(a) + log C) for salt of weak acid and strong base. pH = (1)/(2) ( pK_(w)- pK_(b) - log C ) for salt of weak base and strong acid. pH = (1)/(2) ( pK_(w) + pK_(a) - pK_(b)) for salt of weak acid and weak base The pH of 1M PO_(4(aq))^(3-) soluiton will be ( given pK_(b) of PO_(4)^(3-) = 1.62 )

What is the normality of 1 M H_(3)PO_(4) solution ?

The normality of 1.5M H_(3)PO_(4) is-

The pH of blood is 7.4 . What is the ratio of [(HPO_(4)^(2-))/(H_(2)PO_(4)^(-))] in the blood. pK_(a)(H_(2)PO_(4)^(-))=7.1

a. A solution of caF_(2) is found to contain 10^(-4)M F^(Θ) ions. What is the K_(sp) of caF_(2) ? b. A solution of calcium phoshate contains 2 xx 10^(-5)M PO_(4)^(3-) ions. What is K_(sp) of ca_(3)(PO_(4))_(2) ? c. A solution of Ca_(3)(PO_(4))_(2) contains 6 xx 10^(-5)M ca^(2+) ions. What is the K_(sp) of Ca_(3) (PO_(4))_(2) ? d. A solution of Zr_(3)(PO_(4))_(4) constains 8 x 10^(-5) M PO_(4)^(3-) ions. what is the K_(sp) of Zr_(3) (PO_(4))_(4) ? e. A solution of Zr_(3)(PO_(4))_(4) contain 3 xx 10^(-5) M Zr^(4+) ions. What is the K_(sp) of Zr_(3)(PO_(4))_(4) ?

What is the normality of 0.3 M H_(3)PO_(4) solution ?

DINESH PUBLICATION-IONIC EQUILIBRIUM -MULTIPLE CHOICE QUESTIONS
  1. pK(a) of CH(3)COOH is 4.74 . The pH of 0.01 M CH(3)COONa IS

    Text Solution

    |

  2. pK(b) of NH(3) is 4.74. The pH when 100 mL of 0.01 M NH(3) solution is...

    Text Solution

    |

  3. The pH of 1 M PO(4)^(3-) (aq) solution is, [ Given pK(b)=(PO(4)^(3-)...

    Text Solution

    |

  4. Hydrolysis constant of NH(4)^(+) is 5.55 xx 10^(-10). The ionisation c...

    Text Solution

    |

  5. The pH of 0.1 M NaHCO(3) is (Given K(a1) and K(a2) for H(2)CO(3) are 6...

    Text Solution

    |

  6. pK(a1) and pK(a(2)) of H(2)CO(3) are 6.38 and 10.26 respectively. The ...

    Text Solution

    |

  7. pK(a1) , pK(a(2)) and pK(a(3)) of H(3)PO(4) are respectively x,y and z...

    Text Solution

    |

  8. pH of the solution containing 50.0 mL of 0.3 M HCl and 50.0 mL of 0.4 ...

    Text Solution

    |

  9. pH at which an acidic indicator with K("in")=1xx10^(-5) changes colour...

    Text Solution

    |

  10. pH at which a basic indicator with K("in")=1xx10^(-10) changes colour ...

    Text Solution

    |

  11. A weak base, B, has basicity constant K(b)=2xx10^(-5). The pH of any s...

    Text Solution

    |

  12. pH of 0.01 M (NH(4))(2) SO(4) and 0.02 M NH(4)OH buffer (pK(a) of NH(4...

    Text Solution

    |

  13. 100mL of pH =6 solution is diluted to 100mL by water. pH of the soluti...

    Text Solution

    |

  14. Auto-ionisation of liquid NH(3) is 2NH(3) hArr NH(4)^(o+) +NH(2)^(Th...

    Text Solution

    |

  15. BOH is a weak base, molar concentration of BOH that provides a [OH]^(-...

    Text Solution

    |

  16. Which of the following solution will have pH of 4.74

    Text Solution

    |

  17. Which of the following mixtures will act as a buffer solution when dis...

    Text Solution

    |

  18. For the reaction S(2)O(3)^(2-)(aq) +2H(3)O^(+)(aq) hArr S(s)+H(2)SO(...

    Text Solution

    |

  19. Both HCOOH and CH(3)COOH solutions have equal pH. If K(1) // K(2) ( r...

    Text Solution

    |

  20. pH of Ca(OH)(2) solution is 12. Millimoles of Ca(OH)(2) present in 100...

    Text Solution

    |