Exp 3 Part A pH Titrations Slides

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Chemistry

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Feb 20, 2024

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8/2/2023 1 CHEM 111: Part A. Titration and Standardization of a Solution Titration and Standardization Learning Objectives: 1. Prepare a standard solution. 2. Conduct a titration to analyze a solution. 3. Calculate % percent difference between two values. 4. Calculate moles of solution. 5. Calculate molarity of solution. 1 2

8/2/2023 2 Part A. Purpose 3 Molarity Molarity ( ) = M moles solute (mol) liters solution (L) Purpose: The purpose is to determine the exact molarity of a sodium hydroxide (NaOH) solution by standardizing the solution with KHC 8 H 4 O 4 (potassium hydrogen phthalate) known as KHP. K H C 8 H 4 O 4 (aq) + Na OH (aq) → KNaC 8 H 4 O 4 (aq) + H 2 O (l) acid base salt (neutral) water (neutral) Neutralization reaction Part A. Standardization • Label a 250- mL beaker as “NaOH.” The NaOH is the titrant and analyte. • Label a 250- mL Erlenmeyer flask as “KHP.” KHP is an acid that reacts with NaOH. • Fill the 250-mL beaker half full of NaOH solution (approximately 100 mL). 3 4

8/2/2023 3 5 Titration Using a Burette Burette Tightening Nut Stopcock Erlenmeyer flask contains analyte (solution) with unknown concentration Tip Burette Clamp Ring stand or stirring plate 6 Filling a Burette 1. Pre-rinse burette with the solution (NaOH titrant). Discard rinse. 2. Fill burette past 0.00 mL mark. 3. Remove air bubble from tip. 5 6

8/2/2023 4 7 Part A. Preparing KHP Standard 1. Tare a weigh boat and weigh about 0.60 g KHP. Record exact mass. 2. Transfer KHP into a 250-mL Erlenmeyer Flask using deionized water from the wash bottle. 3. Add 30.0 mL of deionized water using a 50-mL graduated cylinder. Add 3 drops of phenolphthalein. Part A. Table 1 Fill in Table 1. with mass of KHP Is this the correct number of significant figures ? Yes! Write down every digit on balance. Trial m KHP (g) V i (mL) V f (mL) Δ V (mL) 1 0.5834 2 3* 4* 7 8

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