Chapter 08 - Instructor Dr Daniel Seidel Chem 315 Chapter 8...

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Chapter 8 – Acidity, Basicity and p K a Instructor: Dr. Daniel Seidel Chem 315 Brønsted definitions of acids and bases An acid is a species having a tendency to lose a proton A base is a species having a tendency to accept a proton G° value corresponds to only 1 molecule of HCl in 10 240 being dissociated! The key to proton stabilization is water. hydronium ion
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An isolated proton is so reactive that it will even add on to a molecule of methane in the gas phase to give CH 5 + It is extremely unlikely to have a naked proton in the gas phase. Naked protons never exist in solution. Every acid has a conjugate base. Water acting as a base: Water acting as an acid: For any acid and any base: AH is an acid and A is its conjugate base B is a base and BH + is its conjugate acid every acid has an associated conjugate base and every base has an associated conjugate acid.
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Acetic acid acting as a base: Compounds such as water that can act as either an acid or a base are called amphoteric. Most compounds can be considered as amphoteric to some extent. Amino acids are amphoteric because they have separate acidic and basic groups built into the same molecule.
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How the pH of a solution depends on the concentration of the acid Remember
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