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Unformatted text preview: Joseph Leonard Dave Aspinall, Alexander Fattell Green H May 8, 2009 Acid Base Titration Lab Purpose: The purpose of this lab is to visually observe a double-replacement reaction by performing an acid base titration with sodium hydroxide (NaOH) and hydrochloric acid (HCl). The lab also demonstrated how to use titration to find an unknown molarity of a substance. Data: Sample Number Volume NaOH 1 12.3 mL 2 12.4 mL 3 12.5 mL Average 12.4 mL Molarity Calculations M 1 V 1 = M 2 V 2 M – Molarity, V – Volume M NaOH = 0.98 M Observations: • HCl and NaOH appeared identical before titration began; both looked like water. • When the phenolphthalein indicator was added to the hydrochloric acid and water solution, the mixture remained clear and colorless. This is because phenolphthalein only appears pink in the presence of a base. • When the alkaline NaOH is added to the acid solution the drops turned into a fuchsia color because of the phenolphthalein. Once the Erlenmeyer flask was swirled, the solution returned to being colorless because there was more acid in the flask than base at this point. •...
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