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Science
Chemistry
Acids and Alkalis
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Created by
Antony
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Cards (38)
What does the pH scale measure?
The
acidity
or
alkalinity
of a solution
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How can the pH of a solution be measured?
Using a
pH probe
or
universal indicator
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What pH value indicates a neutral solution?
7
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What happens to an indicator when an acid is added?
It changes
color
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What is the pH of a strong acid?
Less than
7
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What is the pH of a strong alkali?
Greater
than
7
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What is produced in a neutralization reaction?
Salt and water
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What is the general word equation for neutralization reactions?
Acid
+
Alkali
→
Salt
+ Water
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What is the product of hydrochloric acid and sodium hydroxide?
Sodium chloride
and water
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What is produced when sulfuric acid reacts with calcium carbonate?
Calcium sulfate, water, and carbon dioxide
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What is the test for carbon dioxide?
It turns
limewater cloudy
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What color does litmus turn in acids?
Red
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What color does litmus turn in alkalis?
Blue
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What is the pH of stomach acid?
1
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What is the purpose of neutralization in gardening?
To ensure soil has the correct pH
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How does neutralization help with insect stings?
It
neutralizes excess
acid from the sting
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How does neutralization help with indigestion?
It neutralizes
excess
acid in the
stomach
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What is the general equation for acid and metal carbonate reactions?
Acid + Metal Carbonate → Salt + Water +
Carbon dioxide
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What is observed when an acid reacts with a metal carbonate?
Fizzing due to
carbon dioxide
production
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What is the color change of red cabbage indicator in acid?
Red
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What is the color change of red cabbage indicator in alkali?
Blue
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What is the meaning of the old hazard symbol for corrosive substances?
Attacks and destroys living tissues
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What does the new hazard symbol for flammable substances indicate?
Catches fire
easily
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What does the hazard symbol for biohazard indicate?
Biological substances that threaten health
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What does the hazard symbol for toxic substances indicate?
Can cause death if swallowed or inhaled
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What is the significance of hazard warning labels?
To indicate
chemical hazards
in
substances
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What is the role of indicators in measuring pH?
They change color in
acids
or
alkalis
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Why is the type of salt produced in a neutralization reaction important?
It depends on the
acid
and
alkali
used
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How does the pH scale relate to everyday substances?
It indicates
acidity
or alkalinity of substances
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What is the pH of stomach acid?
pH
1
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Why is tomato juice considered a weak acid?
It has a pH of 4
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What is the pH of baking soda?
pH 9
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What does a pH of 12 indicate about bleach?
It is a strong
alkali
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What is neutralization and its importance?
Alkalis
cancel out
acids
, making them neutral
Important in gardening and agriculture for
soil pH
Helps with insect stings and bites
Controls
indigestion
from excess
stomach acid
Maintains
correct pH
in foods like jam
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What is the general equation for neutralization?
acid
+
alkali
→
salt
+ water
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What type of salt does hydrochloric acid produce?
Chloride salts
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What type of salt does sulfuric acid produce?
Sulfate salts
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What type of salt does nitric acid produce?
Nitrate salts
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