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CHEM 111 (69)

Acids (and bases) in electrolytes, redox reactions, oxidation number

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Colorado State University
CHEM 111
Dana Johnson

17 November Kinetic energy is related to temperature Speed depends on molar mass & T Acids (and bases) in electrolytes Compounds that ionize in solution will conduct electricity Amount of current related to amount of ionization Strong acids → strong electrolyte HCl (g) – H2O→ H (aq) + Cl (aq) Weak acids → weak electrolyte H2O + - HC H2O 3l)2– → H (aq) + C H O 2aq3 2 Acid / base reactions In every acid / base reaction we will consider, the products are water and a salt HX (aq) + MOH (aq) → H O (l) +2MX (aq) Example with equations HCl (aq) + Na(OH) (aq) → ? Molecular equation: HCl (aq) + Na(OH) (aq) → NaCl (aq) + H O (l) 2 Total ionic: H (aq) + Cl (aq) + Na (aq) + OH (aq) → Na (aq) + Cl (aq) + H O (l)- 2 Net ionic: + - H (aq) + OH (aq) → H O (l) 2 Clicker question Is there ever a time when the total ionic and net ionic equations are identical? A. Never B. Sure If the salt that is formed is insoluble, there are no spectator ions Redox reactions Redox – oxidation-reduction reactions, where there is an exchange of electrons, occurs in both ionic and covalent reactions Redox terminology Oxidation – loss of electrons Reduction – gain of elec
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