Analysis of stomach antacids

Analysis of stomach antacids - TITRATION: STANDARDIZATION...

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TITRATION: STANDARDIZATION OF A BASE AND ANALYSIS OF STOMACH ANTACID TABLETS © 2009, 1996, 1973 by David A. Katz. All rights reserved. Reproduction permitted for education use provided original copyright is included. PART I: PREPARATION OF SOLUTIONS AND STANDARDIZATION OF A BASE OBJECTIVE: The object of this experiment is to become familiar with making solutions and to titrate an acid with a base. One solution will be prepared from a solid and one solution will be prepared by dilution of a concentrated solution. MATERIALS NEEDED: hydrochloric acid, HCl, 12 M (concentrated) sodium hydroxide, NaOH (pellets) phenolphthalein solution (1% by mass in ethanol) 10 mL graduated cylinder 100 mL graduated cylinder 500 mL volumetric flask with cap or stopper 1000 mL volumetric flask with cap or stopper 2 125-mL Erlenmeyer flasks 2 burets, 25-mL or 50-mL stirring rod 2 small funnels to fit the burets SAFETY PRECAUTIONS: Wear approved eye protection in the laboratory at all times. Concentrated hydrochloric acid is corrosive. In the event of skin contact, wash well with water. If the skin is blistered or broken, seek professional medical treatment. The dilute hydrochloric acid is less reactive, but one should exercise similar precautions. Sodium hydroxide is caustic. Do not handle the solid with your hands. In the event of skin contact, wash well with water. If the skin is irritated or broken, seek professional medical treatment. The dilute sodium hydroxide solution is less caustic, but one should exercise similar precautions. When diluting the hydrochloric acid, remember to add the concentrated acid to water to avoid splattering. Take care in handling the container as the dilution will generate heat. Dissolving of sodium hydroxide generates heat. Take care in handling the dilution container. DISPOSAL: All solutions in this experiment should be disposed of in the proper waste containers as provided in the laboratory. PREPARING SOLUTIONS: Prepare 1000 mL of 0.1 M hydrochloric acid solution starting with 12 M HCl (see Diluting Solutions, below). Use distilled or deionized water. The solution will be prepared in a 1000-mL volumetric flask.
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2 To prepare the hydrochloric acid solution: Determine the amount of 12 M hydrochloric acid needed. Fill the volumetric flask approximately 75% full with water. Use a funnel. Add the hydrochloric acid to the volumetric flask. Carefully, rinse any residual hydrochloric acid from the graduated cylinder and the funnel into the volumetric flask using three 5 mL portions of distilled water from a wash bottle. Stopper the volumetric flask and gently shake the solution. Fill the volumetric flask to the 1000-mL mark. Stopper the flask and gently shake the solution. If necessary, adjust the volume of the solution to 1000 mL using distilled water, and shake again.
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This note was uploaded on 12/07/2011 for the course CHEM 152 taught by Professor Staff during the Spring '08 term at Pima CC.

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Analysis of stomach antacids - TITRATION: STANDARDIZATION...

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