AnswersFoothill-B Period-Chemistry-2627BTitration Reactions

Titration Reactions Answers

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t
to determine the concentration of acid in drinking water
t
to find out if the drinking water contains helpful nutrients for the body
t
to find out if there are other poisonous chemicals in the drinking water
t
to determine the molar ratio of acid to base in the drinking water
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most

a
a burette
a
a beaker
a
a volumetric pipette
a
an Erlenmeyer flask
3

most

t
to make sure the burette is not blocked
t
to prevent any bacteria from growing in the burette
t
to make sure the base will flow quickly though the burette
t
to prevent dilution of the base, which may affect the results
4

At what point is a base no longer added during a titration?

w
when the pH increases suddenly in the flask
w
when the phenolphthalein remains clear in the flask
b
before the solution in the flask reaches the equivalency point
b
before half of the base is completely drained from the burette
5

Which is a disadvantage of using chemical indicators?

T
They are expensive to use.
T
They measure pH directly.
T
They must be selected for a narrow pH range.
T
They do not use electricity to operate.
6

Which of the glassware shown below is an Erlenmeyer flask?

Question illustration
A
Option
Option A
B
Option
Option B
C
Option
Option C
D
Option
Option D
7

Which of these is the main goal of any titration?

t
to observe the effect of indicators on acids
t
to observe the effect of indicators on bases
t
to determine the concentration of one of the reactants
t
to determine the effects of a base on one of the products
8

Which of the following is the main reason to use titration in chemistry?

t
to write a balanced chemical equation for a reaction
t
to calculate the number of moles of an acid or base
t
to use stoichiometric ratios for converting moles
t
to find the molarity of an unknown acid or base
9

Maya, a student, performs a titration. She completes the following steps as part of her titration procedure.1. She cleans and rinses a burette with base solution.2. She fills the burette with standardized base solution.3. She adds a base from a burette to an acid.4. She observes a color change in the Erlenmeyer flask.5. She continues to add more base.Based on the above procedure, will she obtain accurate results?

Y
Yes, because the more base there is, the better the results will be.
N
No, because she initially contaminated the burette with base.
Y
Yes, because she used a standardized base solution in the burette.
N
No, because she did not stop adding base once the color changed.
10

A base is added to an acid during a titration. A pH meter is used to monitor the reaction’s progress. When should the addition of base stop?

w
when adding a few drops of base causes a large decrease in pH
w
when adding a few drops of base causes a large increase in pH
w
when adding a few milliliters of base causes a large increase in pH
w
when adding a few milliliters of base causes a large decrease in pH

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