chem exams - CHEM 210 — NIGHT FINAL EXAM NAME 1(30...

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Unformatted text preview: CHEM 210 — NIGHT FINAL EXAM 11/30/04 NAME: 1. (30 POINTS) (a) Suppose that you are using 0.]00M NaOH to tittate a 20.00 mL solution that contains an unknown mixture of HCl and H3P04 and that you Obtain two endpoints -— the first after adding 13.85‘mL and the second after adding a total of 24. 15 mL. Calculate the molarities ofHCl and H3P04 in the unknown. SHOW YOUR WORK. (Formula weights: NaOH, 40.00 gm/molc; HC], 36.46 gin/mole; H3PO4, 98.00 gin/mole) (b) Suppose that you notice that a fellow student titrating his/her unknown performs a similar titration and obtains a titration curve in which the second endpoint volume is exactly double that of the first. Even though you can’t see the endpoint volume, what can you conclude about this unknown? 2. (20 POINTS) (a) What are the strong and weak acids? strong acids: weak acids: (b) Exactly what is it about an acid that allows it to be considered “strong” or “weak”? 3. (24 POINTS) Match the following titration reactions with the plots that you would expect each to exhibit: (a) (b) pH pH mL titrant mL titrant (c) (d) pH PH mL titrant ‘ mL titrant (e) NONE OF THE ABOVE l) 25 mL of 0.10M NaOH with 0.10M I-ICl ~ 2) 25 mL of 0.10M HC] with 0.10M NaOH - 3) 25 mL of 0.10M NazHPO4 with 0.10M NaOH - 4) 25 mL of 0.10M NaHzPO4 with 0.10 M NaOH - 4. (20 POINTS) What is the Nemst equation? Define all terms (including units). 5. (28 POINTS) (3) Outline, in block diagram form, the principal components of a gas chromatography (GC) instrument. ' (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 form, 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.

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chem exams - CHEM 210 — NIGHT FINAL EXAM NAME 1(30...

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