18 - AP Chemistry Lab Hydrolysis of Salts Brockport High...

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AP Chemistry Lab Brockport High School NY USA Hydrolysis of Salts Mr Keefer Introduction Most salts are strong electrolytes and exist as ions in aqueous solutions. Some ions, however, react with water to form either H 3 O + or OH - . Such a reaction with water is called hydrolysis. Whether a solution of a salt will be acidic, neutral, or basic can be predicted on the basis of the strengths of the acid and base from which the salt was formed. Generally, these rules help us predict the nature of the solution: 1. Salt of a strong acid and a strong base yield a neutral solution, pH = 7 2. Salt of a strong acid and a weak base yield a cation that hydrolyzes, forming H + ions pH<7 3. Salt of a weak acid and a strong base yield an anion that hydrolyzes, forming OH - ions, , pH>7 4. Salt of a weak acid and a weak base yield both ions that hydrolyze; the pH of the solution is determined by the relative extent (K a , K b ) to which each ion hydrolyzes. In this experiment, we will test the pH of water and of several aqueous salt solutions to
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18 - AP Chemistry Lab Hydrolysis of Salts Brockport High...

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