Chem 112 test 3

Chem 112 test 3 - Chem 112 - Test 3 Spring 2008 Name ' 1....

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Chem 1 12 - Test 3 Spring 2008 ' Name 1. If 0.10 moles of KF dissolves in enough water to make 500 mL solution then (20 pts) k3 f - H+ a. What ions are found? I I L b. If any of the ions are acids andlo ases identify them, and provide Ka or Kb values. - - &f e- o-I/ c. What is the pH of the solution? I=-+&&+ #C+OU/ Kb:b~x/6% z2-, xc l0IJ6 - Jr .la b 0 / =- < - %a Z X *2-X 2 & -3-2 L LO^= 1.67~16~ 2. Consider two weak acids HA (Ka = 6.1 x 103 and &3 (Ka = 7.9 x (12 pts) a. The stronger of the two weak acids is A P &..- 7 td_ - b. 0.10 M solutions of HA and HI3 were pre ared. The ~8 solution. H~L c. 0.01 M solutions of NaA and NaB were prepared. Both solutions were basic. The solution with the higher pH is the N.8 solution. 8-LJ sb. u &redha A- 4 b~bj'ct huX' "a /rwr ~'cbncc&d&, , i(i br X . d a 3. Consider the following titration curves 11s r.u'- I r Answer true or false for the following questi d. X-' is a weak base - on: (3 pts each) a. HX is a strong acid e b. HZ is a strong acid False c. HY is a weak base F~/sc e. the Ka value for is geater than 3.16 x 10" 7~ f. the pKa value for HY is greater than 7
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Chem 112 test 3 - Chem 112 - Test 3 Spring 2008 Name ' 1....

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