Vocabulary: acid, analyte, base, dissociate, equivalence point, indicator, litmus paper, molarity,
neutralize, pH, strong acid, strong base, titrant, titration, titration curve, weak acid, weak base
Prior Knowledge Qu
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Vocabulary: acid, analyte, base, dissociate, equivalence point, indicator, litmus paper, molarity,
neutralize, pH, strong acid, strong base, titrant, titration, titration curve, weak acid, weak base
Prior Knowledge Questions (Do these BEFORE using the Gizmo.)
There are several definitions of acids and bases. According to the
Brønsted-Lowry definition, an acid is a substance that is capable of
donating a proton to another substance. A base is a substance that
accepts protons. When an acid and a base are combined, the acid is
neutralized as the base accepts the protons produced by the acid.
One way to determine if a solution is acidic or basic is to use litmus paper, as shown above.
There are two types of litmus papers: red and blue.
How does litmus paper indicate an acid? If it is red litmus paper, depending
upon the level of acidity or how high the pH level is. The higher
the pH level the more the red litmus paper will turn blue. On the
other hand, blue litmus paper will turn red depending upon how
low the pH level is or how acidic the solution is.
How does litmus paper indicate a neutral substance? If the substance is neutral,
that means there are equal amounts of acids and bases in the
solution. If this is the case, both red and blue litmus paper will
turn purple.
How does litmus paper indicate a base? If it is blue litmus paper, depending
upon the level of acidity or how low the pH level is. The lower the
pH level the more the blue litmus paper will turn red. On the
other hand, red litmus paper will turn blue depending upon how
high the pH level is or how alkaline the solution is.
Gizmo Warm-up
Litmus is an example of an indicator, a substance that changes
color depending on its pH (pH is a measure of the concentration of
protons, or H+
ions). In the Titration Gizmo, you will use indicators to
show how acids are neutralized by bases, and vice versa.
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