Acids leave a sour taste in my mouth!
Acids
A substance that releases hydrogen ions when
dissolved in water.
H+ Hydrogen ions
Main Characteristic of Acids
Sour
Conduct
electricity
Corrosive
Predictable
color changes
with indicators
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Another name for acids is ___proton
donor___ because the
___hydrogen ion__________ is a ______proton________.
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Teacher Demonstration of another property of some acids:
Some acids _react__ with __active
metals_ to release _hydrogen gas___.
____Mg____ + ___HCl____ ------- _____MgCl2__ + _____H2___
Magnesium
Hydrochloric Acid
Magnesium chloride
Hydrogen gas
What happened?__________________________________________________________
_________________________________________________________________________
Why did it happen?
-Magnesium
reacted with Hydrochloric acid to release
hydrogen gas.
-Hydrogen gas is flammable and caught on fire.
________________________________________________________________________
9-1 What is an acid?
Lesson Review
Complete the following.
Burns ____________________________________ to the skin.
1. Acids can cause
2. Acids are sometimes called
Proton (H+) ________________________________ donors.
3. An acid can react with a metal to release
hydrogen ____________________________ gas.
4. Acids can react with certain chemicals to produce predictable
5. An acid gives a substance a
sour ____________________________________________ taste.
6. A hydrogen ion is the same as a
7. Hydrogen
color changes _ changes.
proton __________________________________________ .
ions ________________________________________ give acid its familiar taste.
8. When an acid is dissolved in
9. Acids conduct
water _________________ , it forms positive and negative ions.
electricity because of the ions released in the
water. ________________________________________________________________________ .
10. In the chemical formula for an acid, the symbol
H ____________________
Skill Challenge
Skills: classifying, relating
Identify whether each of the following chemical formulas could represent an acid
by writing yes or no in the spaces provided.
Chemical
Formula
Acid?
1. HNO3
Yes –
nitric acid
2. NaCl
no
3. CO2
no
4. H2SO4
5. HCl
Yes –
sulfuric
acid
Yes –
hydrochloric
acid
6. CaSO4
No
7. H3BO3
Yes –
boric acid
8. KBr
no
always appears first.