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ACIDS AND BASES
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Acids Bases Operational Definitions (properties) A. Electrolytes
Strong acids: completely dissociate into ions (hydrochloric, nitric, sulfuric, hydrobromic, and hydroiodic) Weak acids: do not completely dissociate into ions. (all other acids) Operational Definitions (properties) A. Electrolytes Strong bases: completely dissociate into ions. (soluble hydroxides on table F) Weak bases: do not completely dissociate into ions. (insoluble hydroxides on table F)
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Acids Bases B. Taste sour Ex: citric acid in oranges
Lactic acid in milk B. Taste bitter, feel soapy and slippery
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C. Change the color of acid-base indicators. (table M)
Acids pH: between 1 & 7 Litmus: red stays red, blue turns red Bromothymol blue: Yellow Phenolphtalein: Clear Bases Between 7 and 14 Red turns blue, blue stays blue Blue Pink
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D. Undergo neutralization Acid + Base →Salt + Water ex: HCl + NaOH→NaCl + HOH
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Acid Bases E. Metal + acid →salt + hydrogen
Use table J (only metals above hydrogen can replace it) Ex: Mg + 2HCl→MgCl H2 E. Emulsify (breaks down) fats and oils
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Acids Bases Conceptual definitions (explanations) A. Arrhenius:
Acids contain the hydrogen ion or hydronium ion as the only positive ion. Table K Ex: HCl, HBr, HF Conceptual definitions (explanations) A. Arrhenius: Bases contain the hydroxide ion as the only negative ion. Table L Ex: NaOH (note: first element is a metal)
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Acids Bases B. Bronsted-Lowry: An acid is a proton donor Example:
NH3 + H2O → NH4+ Base acid 2 B. Bronsted-Lowry A base is a proton acceptor NH OH- Acid 1 + base 2
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Acids Bases C. Lewis: Electron Pair Acceptor C. Lewis:
Electron Pair Donor
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Acids Bases Additional information: Monoprotic (1H: HCl) Diprotic
(2H: H2SO4) Polyprotic (more than 2H: H3PO4) Additional information: Amphiprotic or amphoteric: acts as either an acid or a base. Example: H2O and HSO4-
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Acids Bases Naming acids Binary acids: H nonmetal
Hydro stem of nonmetal ic acid Ex: HCl: hydrochloric Ternary acids H – polyatomic ion Table E ate becomes ic acid and ite becomes ous acid Example: H2SO4 : sulfuric acid (no hydro) Naming bases Name the metal (use a roman numeral if a metal has more than one oxidation number) followed by hydroxide Example: KOH: potassium hydroxide
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