CH 203 Problem 17

# CH 203 Problem 17 - CH 203 Problem 17.32 17.32 Consider the...

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CH 203 Problem 17.32 17.32 Consider the titration of 30.0 mL of 0.030 M NH 3 with 0.025 M HCl. Calculate the pH after the following volumes of titrant have been added: (a) 0 mL In a titration problem, the titrant is what is in the buret (in this case, 0.025 M HCl.) Here, the ammonia is in the beaker (we know the volume of it.) now that we know what goes where, we can proceed. in the beaker, we have remember that this is a titration problem - when we add some HCl from the buret, the final volume in the beaker changes. our strategy will be as follows: 1) write a balanced equation for the reaction; 2) recognize that the reaction between the strong and weak species will go to completion (i.e. until the quantity present in the lesser amount is gone) 3) figure out what is left when the reaction is complete and 4) find the pH from the resulting equilibrium. Here goes: in part (a), we haven't added any HCl yet, so we're just calculating the pH of 0.030 M NH 3 (K b = 1.8 x 10 -5 ). Hopefully you can do this one in your sleep by now; you should get pH = 10.86.

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CH 203 Problem 17 - CH 203 Problem 17.32 17.32 Consider the...

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