Chem Pre-Lab 2

Chem Pre-Lab 2 - solution PRE-LAB QUESTIONS: 1. a.) Use...

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02/11/08 Studying the pH of Strong Acid, Weak Acid, Salt, and Buffer Solutions PURPOSE: The purpose of this lab is to compare the pH of HCl and acetic acid solutions, then calculate the acid dissociation constant of acetic acid. SAFETY: 1. Always wear safety goggles. 2. Handle glassware w/ care. 3. Acetic Acid- Corrosive and Irritant Hydrochloric Acid-Toxic, Corrosive and Irritant Phenolphthalein Solution- Flammable and Toxic Sodium Hydroxide-Toxic and Corrosive PROCEDURE: 1. Prepare HCl solutions of various concentrations 2. Use pH meter to determine pH of HCl solutions 3. Prepare HC 2 H 3 O 2 buffer solution 4. Add HCl and NaOH solutions to separate samples of buffer solution 5. Add HCl and NaOH solutions to separate samples of buffer solution and to distilled or deionized water 6. Determine pH of buffer solution and water samples after addition of HCl and NaOH
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Unformatted text preview: solution PRE-LAB QUESTIONS: 1. a.) Use caution with HCl solution because Hydrochloric Acid can be toxic, corrosive and an irritant to your skin. b.) To prepare for discarding, add .5 mL of 6M NaOH to your beaker, checking the pH. 2. a.) A strong acid is an acid that completely dissociates in water, forming a weak conjugate base and a Hydronium ion, while a strong base is a base that completely dissociates in water, forming a weak conjugate acid an Hydroxide ion. b.) A strong acid is an acid that completely dissociates in water, forming a Hydronium ion and a weak conjugate base, while a weak acid is an acid that only dissociates into 10% or less of Hydronium ion. 3. a.) pH= -log(1.5E-3)= 2.82 b.) pH= 14-(-log(3.1E-4))= 10.5 c.) [H+]= 10^(-8.42)= 3.80E-9 d.) [H+]= 10^(-(14-5.58))= 3.80E-9...
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Chem Pre-Lab 2 - solution PRE-LAB QUESTIONS: 1. a.) Use...

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