Honors Chemistry Unit 11 – Acids and Bases. Lesson 3 – Properties of Acids and Bases Do Now: Prepare for Quiz 11-2. Over the years, there have been changes to the way an acid or base was defined. Nevertheless, they exhibit the same properties regardless of definition. Properties of Acids
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Lesson 3 – Properties of Acids and Bases
Do Now: Prepare for Quiz 11-2.
Properties of Acids
Colorless in phenolpthalein (titration lab)
Orange in methyl orange (another indicator)
React with most metals
Taste sour (citric acid in lemon juice)
Turns litmus paper red (Red = Acid)
pH 0-6.99Properties of Acids and Bases
They both sting wounds & flesh
They are both electrolytes
Both produce salts in reactions
An electrolyte is an ion in solution.
NaCl Na+(aq) + Cl-(aq)
Any salt dissolved in water is an electrolyte.
Electrolytes improve the flow of electricity in a solution, which your nerves need to transmit electrical signals throughout your body.
http://www.youtube.com/watch?v=uxieMOdo6IUProperties of Acids and Bases
This is an example of a Bronsted-Lowry acid/base reaction.
The proton on the acid (HCl) is accepted by the base (NH3)
After the HCl loses the proton, Cl- is now considered a base (because it could possibly receive a proton again) – called a conjugate base
Same with the NH3 accepting the proton – the NH4+ could give the proton away, making NH4+ a conjugate acid.
HCl + NH3 NH4+ + Cl-
Acid Base C.A. C.B.Acid/Base Reactions
Amphoteric – both an acid and a base
H2O + H2O H3O+ + OH-
Acid Base C.A. C.B.
This happens all the time – the reason water is neutral is because at all times, there are equal amounts of H3O+ and OH- !!Water