Acid - Acid-base Reactions Nicole Marshall Nathalee Delgado...

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Acid-base Reactions Nicole Marshall*, Nathalee Delgado Chemistry 101, Los Angeles Harbor College Introduction- This laboratory exercise is divided into four portions.  In the first lab period  students learn how to titrate HCl, an acid, against a base NaOH.  Once having  prepared the acidic and basic solutions to be used throughout the experiment  you are now able to carry out titration technique.  Titration is a term which refers  to the method of cautiously adding precise amounts of a measured solution into  another one until a reaction occurs.  Indicators are colored dyes which are used  as a gauge to measure for the appearance of an acid or base.  In this case  Phenolphthalein is the indicator of choice to display condition of the liquid.  This  instrumental dye is colorless in acids but turns shades of pink in basic solutions.  These laboratory exercises allow students to develop good titrating techniques in  order to calculate the exact amount of base required to neutralize the acid.  
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