Chem 112 Final UPDATED ACTUAL Questions and CORRECT Answers
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Course
Chem 112
Institution
Chem 112
Chem 112 Final UPDATED ACTUAL
Questions and CORRECT Answers
Determine the correct sequence of steps used in carrying out a measurement using a pH
probe. Rank them in order from first to last. - CORRECT ANSWER- Remove probe from
solution
Rinse probe with deionized or distilled water and blot...
Chem 112 Final UPDATED ACTUAL
Questions and CORRECT Answers
Determine the correct sequence of steps used in carrying out a measurement using a pH
probe. Rank them in order from first to last. - CORRECT 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 - CORRECT ANSWER- ✔✔
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 - CORRECT ANSWER- ✔✔
A substance that produces an excess hydrogen ions (H+) in aqueous solution - CORRECT
ANSWER- ✔✔Arrhenius Acid
A substance that produces an excess of hydroxide ions (OH-) in aqueous solution. -
CORRECT 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 - CORRECT ANSWER-
✔✔Other
Identify the Lewis Acid and Lewis Base in each of the following reactions:
Cl- + AlCl3 ---> AlCl4-
BF3 + F- ---> BF4-
NH3 + H+ ----> NH4+ - CORRECT ANSWER- ✔✔Cl- Lewis Base
AlCl3 Lewis Acid
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? - CORRECT 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. - CORRECT ANSWER- ✔✔.0519 M
These are sour, corrosive, capable of changing litmus paper from blue to red, reactive with
alkalis. - CORRECT ANSWER- ✔✔Acids
Bitter, slippery, changed litmus from red to blue and were reactive with acids - CORRECT
ANSWER- ✔✔Alkalis (Bases)
This is a substnace that ionizes when dissolved in water to yield H+ ions. - CORRECT
ANSWER- ✔✔Arrhenius Acid
Substnace that ionizes when dissolved in water to yield the OH- ion - CORRECT ANSWER-
✔✔Arrhenius Base
What were the limitations to the Arrhenius theory? - CORRECT ANSWER- ✔✔It did not
account for observed acid base behavior in nonaqueous solutions. It did not explain the fact
that many compounds containing hydrogen did not provide an acidic solution when dissolve
in water. It did not classify bases that did not contain OH-, did not explain why substances
like Na2CO3 behaved like bases, or why hydrogen containing compounds such as NaHCO3
did as well.
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