9 - AP Chemistry Lab Titration of Acids and Bases Brockport...

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AP Chemistry Lab Brockport High School NY USA Titration of Acids and Bases Mr Keefer Introduction One of the most common and familiar reactions in chemistry is the reaction between an acid and a base. This reaction is called neutralization . H 3 O + (aq) + OH - (aq) 2H 2 O (l) In this experiment you will use this reaction to determine accurately the concentration of a sodium hydroxide solution prepared by the instructor. This process is called standardization . Next you will determine the amount of acid in an unknown solution using your standardized base in a process called titration . An indicator solution is used to determine when the acid has exactly neutralized the base, or vice versa. A suitable indicator is one that changes color when equivalent amounts of acid and base are present. The color change is called the end point of the titration. In this lab, we will use phenolphthalein as an indicator which turns pink at a pH of approximately 9. In this experiment your NaOH solution will be standardized by titrating it against a very pure
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9 - AP Chemistry Lab Titration of Acids and Bases Brockport...

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