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Chem 112 Final Exam Study Guide Solutions

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Chem 112 Final Exam Study Guide Solutions Determine the correct sequence of steps used in carrying out a measurement using a pH probe. Rank them in order from first to last. - ANSWER-Remove probe from solution Rinse probe with deionized or distilled water and blot dry Place probe in solution t...

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  • November 3, 2024
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Chem 112 Final Exam Study Guide

Solutions


Determine the correct sequence of steps used in carrying out a measurement using a pH probe. Rank

them in order from first to last. - ANSWER✔✔-Remove probe from solution




Rinse probe with deionized or distilled water and blot dry




Place probe in solution to be measured




Observe readout on meter of sample solution pH




Rinse probe, blot dry, then place in storage solution


Read the buret. 13.79 mL - ANSWER✔✔-




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The titration shown here has an equivalence point at pH = 7.4. Using this table,

(https://sites.google.com/site/chempendix/indicators) identify which of the following indicators would

be appropriate for this titration. Check all that apply.




Phenolphthalein


Bromocresol purple


Metacresol purple - ANSWER✔✔-


A substance that produces an excess hydrogen ions (H+) in aqueous solution - ANSWER✔✔-Arrhenius

Acid


A substance that produces an excess of hydroxide ions (OH-) in aqueous solution. - ANSWER✔✔-

Arrhenius Base


A substance that can donate a hydrogen ion to another substance




A substnace that can accept a hydrogen ion from another substance - ANSWER✔✔-Other


Identify the Lewis Acid and Lewis Base in each of the following reactions:




Cl- + AlCl3 ---> AlCl4-
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BF3 + F- ---> BF4-




NH3 + H+ ----> NH4+ - ANSWER✔✔-Cl- Lewis Base


AlCl3 Lewis Acid




BF3 Lewis Acid


F- Lewis Base




NH3 Lewis Base


H+ Lewis Acid


Bronsted acid or base?


CH3CH2NH3+


CH3CH2O-



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C6H5OH - ANSWER✔✔-Acids:


CH3CH2NH3+


C6H5OH


Base:


CH3CH2O-


Calculate the pH for the H3O+ concentration.


H3O+ = 1.0 x10^-8 M - ANSWER✔✔-pH= 8


Calculate the pH for the H3O+ concentration.


H3O+ = .01 M - ANSWER✔✔-2


Calculate the pH for the H3O+ concentration.


H3O+ = 1.0 x 10^-11 M - ANSWER✔✔-pH= 11


Potassium hydrogen phthalate (KHP, molar mass = 204.22 g/mol) is often used as a primary standard in

acid-base titration. If 19.45 mL of NaOH is required to neutralize 0.472 g of KHP, what is the

concentration of the NaOH? - ANSWER✔✔-.119 M


This graph shows the titration of 35.0 mL of methylamine solution with a 0.0865 M HCl. Determine the

molarity of the methylamine solution. - ANSWER✔✔-.0519 M


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