AcidBase Titrations Choice I Lab

AcidBase Titrations Choice I Lab - Acid/Base...

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Acid/Base Titrations—Choice I Rodriguez 1 Acid/Base Titrations—Choice I CHEM 1412 SE1 South Texas College Spring 2016 Dr. Subrata Mandal Bianca I. Rodriguez
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Acid/Base Titrations—Choice I Rodriguez 2 Objective The purpose of this lab experiment was to analyze the titration process of an unknown acid sample by using a sodium hydroxide solution as a titrant. Materials Used 3 Erlenmeyer flasks (250 mL each) 1 electric balance beam Distilled water 500 mL bottle and stopper Phenolphthalein KHP NaOH solution Gloves Goggles Lab apron Pipet Burette Burette stand and clamp Summary of Procedures A. Preparation of the Burets and Pipets a. Rinse pipets and burets to see if they’re clean. If dirty, put a few milliliters of soap solution and have it where the soap touches everywhere along the burets and pipets. Then, rinse with tap and distilled water. B. Preparation of Sodium hydroxide Solution a. Get a clean 1 liter bottle and stopper, and label it “About 0.1 M NaOH”. Add 500 mL of distilled water. Then, weigh about 2.0 grams of sodium hydroxide pellets and put them in the 500 mL volumetric flask. Once dissolved, add distilled water to the flask until the level is 1 inch from the top. Stopper and shake. C. Standardization of the Sodium Hydroxide Solution a. Attain 3 clean 250 mL Erlenmeyer flasks, and label each as 1, 2, and 3. Weigh 3 samples of KHP between 0.3 g – 0.4 g for the 3 flasks and record. Weigh 3 samples of KHP sample 1, add 100 mL of water, 2 drops of phenolphthalein solution, and swirl to dissolve KHP. Record initial NaOH solution reading, and then add NaOH to the sample until a drop creates a pale pink color that doesn’t fade. Then, calculate the moles of KHP in all 3 samples. Then, calculate the concentration of NaOH in the titrant (mol/L).
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