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1. (20 points). Indicate whether the. folloWing atatemcnts are TRUE (T) til: FALSE (F) byec-ircling the correct
response a.. Buffer solution-s play impértant tales in maintaining the pH in analytical, biocheamal, and. physiological. processes, b. The titration of a streag baS'e with a weal: acid is an efﬁcient Way of. detennining- the unknown
1 I I r. -“ x . concentration of that strong base-1n a SQiUﬂﬂn. (ID VA c. An acid-base indicator is a soluble- organic dye ﬂaat‘ changes” color noticeably over a fairly narrow-
d.-- When designing: a buffer sciatica (of a Weak acid and a salt of that weak acid), the. weak acid Should
be chosen 3‘0 that ”the-desired pr: Ks. for the weak acid ‘ __ T e. The pH of an aqueous- solution of a pure polyprotic acid such as a protein is known” as theisoi nic point. F (28 points) Fill in the .13in with the MOST APPROPRIATE response (this may require a: single ”Word or
ash'crl‘. phrase, DO NOT use. symboils OI? abbreviaticcs) For full credit.) answers must be COMPLETE and ' ACCURATE.
a. Successive-ionization constants for. polyprotic acids usually- CiECﬂEa 5. «c; by a. factor” of
1.04 to 10E.
1) Molecules or ions that can "fanctioa either as an acid or a base dcpcﬂdiﬂg 1113031116.IEﬂC—IiOilﬂDﬂditiOﬂS equation can be. used to determine: the. pH for any solution that is a mixture of a weak: acid. and -a_.’sal_t of that weak acid, a aM\sa is any procedure. in which the: volume cf' reagent d. A kiﬂgbfmﬁ. 3r *5“ a. needed. to react wiﬂ1-—aoalyte-i.s determined:
e. A E30 Epe f” makes use of the common ion effect, and is: any solution that acids or bases and for $1 \Ki ire, "" 32 solutions.
3.. (3 points) Describe the. difference between the equivalence point and end "point of'a titration-.- 'What does this difference indicate? ...
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- Spring '13