#!/usr/local/bin/perl # This is just a cgi generated HTML submission form. You can do the same # thing with HTML, but for the sake of distribution, I am doing it this way # so that all the files can remain together. # The only thing tricky about the FORM which you use as your user # interface is that each radio multiple choice button series must have NAME # argumnets corresponding to the first field in the answers database. # Also, the VALUE must correspond exactly to the corresponding field in the # answers database. # First print out the HTTP headcer, then print out the form print "Content-type: text/html\n\n"; print qq! Multiple Choice: Titration
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1. Consider 0.2 M solutions of two weak acids, HX and HY. HX has Ka=1.2 x 10-4 and HY has Ka=1.7 x 10-6. A 35.0 mL portion of each is titrated with with 0.1 M NaOH. The volume of NaOH required to reach the stoichiometric point of each is
greater for HX than for HY.
greater for HY than for HX.
identical.
impossible to evaluate based on the data given.

2. A weak acid, HX has Ka=1.2 x 10-4. A second weak acid HY has Ka=1.7 x 10-6. Each is titrated with with NaOH. At the stoichoimetric point of each titration
the pH will be equilvalent.
the pH of the HX solution will be greater than the pH of the HY solution.
the pH of the HX solution will be less than the pH of the HY solution.
the pH of each solution will be equal to 7.

3. For the titration of a weak base with a strong acid, the pH at the stoichiometric point will be:
less than 7 because the base has been totally converted to its conjugate acid.
greater than 7 because a base is being titrated.
equal to 7 because all base has been neutralized by the addition of the strong acid.
less than seven because of an excess of strong acid.

4. Consider the titration of a weak, diprotic acid H2A with a strong base. At a point halfway to the first equivalence point:
[H2A] > [HA-]
[H2A] = [HA-]
[H2A] < [HA-]
no simple relationship between [H2A] and [HA-] exists.

5. In the titration of a weak, diprotic acid, the volume of strong base required to reach the first equivalence point is:
greater than the volume of strong base required to go from the first equivalence point to the second equivalence point
less than the volume of strong base required to go from the first equivalence point to the second equivalence point
Twice the volume of strong base required to go from the first equivalence point to the second equivalence point
equal to the volume of strong base required to go from the first equivalence point to the second equivalence point

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