Lab Activity Acids and Bases - Titration
.General Questions
1. Explain how acid rain forms and list two environmental effects of acid rain.
2. Explain pH and what the normal pH is of the following:
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acid rain
normal rain
acidic solution
basic solution
neutral solution
blood
orange juice
soap
3. Explain titration and what it is used for
Data:
a) Individual data showing 3 trials: total volume of NaOH added, molarity of unknown
acid, final pH of solution using paper and probe. Also average volume NaOH used,
average molarity of unknown acid, avg. pH of the 3 trials.
b) Class data showing averages only of any 3 groups ( including yours) : average
volume of NaOH added, molarity of unknown acid, final pH of solution using probe.
c) Class data bar graph showing ONLY molarity of unknown acid from b) above.
Analysis :
a) show calculations of the unknown molarity of your individual group data of all 3
trials.
acid =
Molarity1 x Volume1
M1V1
base
= Molarity2 x Volume2
= M2V2
b) Assuming the actual value of unknown molarity of the HCl acid was 0.05 M calculate a
% error for each trial.
% error =
actual value ( 0.05 ) - your value
actual value
x 100