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March 26, 2017

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A sample of 7.80L of NH3(ammonia) gas at 22 degrees Celsius and 735torr is bubbled into a 0.350L solution of 0.400M HCl (hydrochloric acid).

The Kb value for NH3 is 1.8x10-5.

Assuming all the NH3 dissolves and that the volume of the solution remains at 0.350L , calculate the pH of the resulting solution.

  • chem - ,

    Use PV = nRT to calculate moles NH3.
    Use M x L to calculate moles HCl.
    Write the equation to determine how much NH4Cl is formed and how much NH3 or HCl is left. I suspect NH3 is in excess; therefore, I suspect all of the HCl will be used and you will be left with NH4Cl and NH3 which is a buffered solution.
    Use the Henderson-Hasselbach equation to solve for the pH. Post your work if you get stuck.

  • chem - ,

    thnaks...

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