blanktest3chem253fall2007

blanktest3chem253fall2007 - Test 3 Chemistry 253 Fall 2007...

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Test 3 Chemistry 253, Fall 2007 Name:_________________________________ Lab section/TA: __________________ You have one class period to complete this test. The test is closed book, closed note (only a calculator is allowed). Express all answers to the correct number of significant figures. You must show all work to get credit for each problem. Useful equations: a ] H [ ] H [ K HA + = + + α a a ] H [ K K A + = + - α ] ][Y [M ] MY [ - 4 n 4 + - = n f K ] EDTA [ ] Y [ 4 Y - 4 - = α ][EDTA] [M ] MY [ ' n 4 4 + - = = - n f Y f K K α F = n q ox red cell E E E - = For a A + n e - a b B; - = a b n E E ] A [ ] B [ log 05916 . 0 F= 9.648 x 10 4 C/mol ( 29 ] X [ ] A [ log 05916 . 0 constant X A, k n E + + = β A to response X to response X A, = k C c ] C [ γ = A μ α μ γ 305 1 51 . 0 log 2 c + - = z = i i i z c 2 2 1 μ a ac b b x 2 4 2 - ± - = - 4 Y α for EDTA: pH - 4 Y α 7 3.8 x 10 -4 8 4.2 x 10 -3 9 0.041 10 0.30 11 0.81 Name:_________________________________ Lab section/TA: __________________ 1
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1 ) (10 points) State whether the following statements are true or false: a) A metal ion indicator used in an EDTA complexometric titration must have a formation constant with the analyte that is less than that of the EDTA-analyte complex.
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