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CHAPTER 14ACIDS AND BASES
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14.1PROPERTIES OF ACIDS AND BASES
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14.1A practical application of acids and bases.
These two flowers are exactly the same genus and species, so why are they different colors?
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14.1A practical application of acids and bases.
These two flowers are exactly the same genus and species, so why are they different colors?
It is the pH of the soil they are grown in.
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14.1What are some properties of acids?
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14.1What are some properties of acids? Sour taste (commonly found in foods) Change the color of pH indicators Most react with active metals to produce H2
React with bases to produce water and a salt (neutralization reaction)
Conduct electricity
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14.1Naming acids
Binary acids – hydrogen and one other element“hydro_________ic acid”
Oxyacids – hydrogen, oxygen, and one other element“per_________ic acid” per -________-ate“_________ic acid” ________-ate“_________ous acid” ________-ite“hypo_________ous acid” hypo_________-ite
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14.1Example 1: Name the following:
H3PO4
HBr
HClO3
HClO2
H2SO4
HC2H3O2 or CH3COOH
HI
HNO3
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14.1Common industrial acids
sulfuric – H2SO4
most commonly produced chemical in the worldmetallurgy, fertilizers, petroleum refining, dehydrating
agent, car batteriesnitric – HNO3
explosives, plastics, pharmaceuticalsphosphoric – H3PO4
fertilizers, animal feed, flavoring in food, detergentshydrochloric – HCl
cleaning metals and masonry, swimming pool acid, stomach acid
acetic – CH3COOH
plastics, food supplements, fungicidecarbonic – H2 CO3
carbonation in sodas
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PH OF SOME COMMON SUBSTANCES
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14.1What are some properties of bases?
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14.1What are some properties of bases? Taste bitter Change the color of pH indicators Feel slippery React with acids to produce water and a salt Conduct electricity
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14.1Naming bases
Use ionic naming rules for –OH and other ionic bases. Some have common names (NH3).
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14.1Common bases
NaOH – oven cleaner, lyeCaO – “lime” on lawns, cement, mortarNH3 - ammonia, cleaner, dissolved in water is NH4OH
Al(OH)3, Mg(OH)2, and NaHCO3 – antacids
NaHCO3 – baking soda
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14.1What determines a “strong” base or acid?
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14.1The strength of acids and bases is based on how easily they
form ions in solution.
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14.1The strength of acids and bases is based on how easily they
form ions in solution.
STRONG ACID
WEAK ACID
When the strong acid ionizes, what is the result?
When the weak acid ionizes, what is the result?
Why would this be important?
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14.1The strength of acids and bases is based on how easily they
form ions in solution.
A strong acid forms lots of H3O1+, a weak acid forms few H3O1+
A strong base forms lots of OH1-, a weak base forms few OH1-
Do not confuse strength with a high concentration. A strong acid could be in a very dilute solution, and a weak acid could be in a very concentrated solution.
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14.1
Without counting ions or measuring conductivity, how could strength be determined?
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14.1The arrow holds the key.
Strong acidHNO3 + H2O H3O+ + NO3
1-
Weak acidHCN + H2O H3O+ + CN1-
Strong baseNaOH Na+ + OH1-
Weak baseNH4OH NH4
+ + OH1-
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14.1Example 2: Show dissociation of these strong bases and
ionization of these strong acids when added to water
Mg(OH)2
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14.1Example 2: Show dissociation of these strong bases and
ionization of these strong acids when added to water
HClO3 + H2O
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14.1Example 2: Show dissociation of these strong bases and
ionization of these strong acids when added to water
NaOH
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14.1Example 2: Show dissociation of these strong bases and
ionization of these strong acids when added to water H2SO4 + H2O
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14.1Example 3: Show ionization of these weak bases and acids
when added to water HCN + H2O
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14.1Example 3: Show ionization of these weak bases and acids
when added to water NH3 + H2O
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14.1Example 3: Show ionization of these weak bases and acids
when added to water H3PO4 + H2O
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14.1Example 3: Show ionization of these weak bases and acids
when added to water HCO3
1- + H2O
acting as a base
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14.1