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Lab_ Titration; Assignment_ Reflect on the Lab (1)
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Lab_ Titration; Assignment_ Reflect on the Lab (1)
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Lab: Titration; Assignment: Reflect on the LabIn this lab, the hydrochloric acid solution was the__________ because its concentration was not
known.
However, the sodium hydroxide solution in the buret was the ___________ because its
concentration was known.
____________________was used as an indicator
because it is colorless in ____________________
solutions and pink in _____________________ - ANS-analyte
titrant
Phenolphthalein
neutral and acidic
basic
Because HCl is a strong acid and NaOH is a strong base, the equivalence point of the
neutralization reaction occurs at pH ___________
Phenolphthalein causes solutions to become pink around pH 8.2. Therefore, you added
_______________________ NaOH than actually needed to neutralize the acid.
So the concentration of HCl you computed was _________________ of the true value, 0.120 M.
- ANS-7
slightly more
a slight overestimate
Suppose that H2SO4 was used in the reaction instead of HCl. How many moles of NaOH would
neutralize 1 mole of H2SO4? - ANS-2
During this lab, you used a buret to add analyte to the flask and to add titrant to the analyte.
Why is a buret a better tool for adding liquid in this experiment than, say, a graduated cylinder? -
ANS-A buret is taller and narrower than a graduated cylinder, so measurements can be made
with more precision.
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