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Unformatted text preview: CHEM 210 — DAY
FINAL EXAM 1 1/29/04
NAME: 1. (30 POINTS) (a) Suppose that you are using 0.100M NaOH to titrate a 20.00 mL
solution that contains an unknown mixture of HCl and H3P04 and that you obtain two endpoints — the ﬁrst after adding 7.85 mL and the second after adding a total of 10.15
mL. Calculate the molarities of HC] and H3PO4 in the unknown. SHOW YOUR WORK.
(Formula weights: NaOH, 40.00 gm/mole; HC], 36.46 gm/mole; H3P04, 98.00 gm/mole) (b) Suppose that you notice that a fellow student titrating his/her unknown performs a similar titration but obtains only one endpoint. Even though you can’t see the endpoint
volume, what can you conclude about this unknown? 2. (20 POINTS) What is a “polyprotic acid”? Give three speciﬁc examples. 3. (24 POINTS) Match the following titration reactions with the plots that you would
expect each to exhibit: mL titrant mL titrant mL titrant mL titrant (e) NONE OF THE ABOVE 1) 25 mL of 0.10M HCl with 0.10M NaOH - 2) 25 mL of0.10M NaOH with 0.10M HC] -
3) 25 mL of 0.10M H3PO4 with 0.10M NaOH -7 4) 25 mL of 0.] 0M NazHPO4 with 0.10 M NaOH - 4. (20 POINTS) What is the Nemst equation? Deﬁne all terms (including units). I
5. (28 POINTS) (a) Outline, in block diagram form, the principal components of a gas
chromatography (GC) instrument. I - (b) In general, what kinds of analytes is GC well suited for? For what kinds of samples is
GC not well suited? 6. (28 POINTS) (a) Outline, in block diagram foim, the principal components of an atomic absorption spectrometer (AAS). (b) In general, What kinds of analytes is AAS well suited for? ...
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This note was uploaded on 09/12/2008 for the course CHEM 209 taught by Professor Greg during the Spring '07 term at University of Louisville.
- Spring '07