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Living By Chemistry SECOND EDITION

Living By Chemistry SECOND EDITION. Unit 4: TOXINS Stoichiometry, Solution Chemistry, and Acids and Bases. Lesson 89: Drip Drop. Titration. ChemCatalyst. A student mixes 100 mL of 0.10 M HCl with different volumes of 0.10 M NaOH. 1: 100 mL of 0.10 M HCl + 50 mL of 0.10 M NaOH

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Living By Chemistry SECOND EDITION

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  1. Living By ChemistrySECOND EDITION Unit 4: TOXINS Stoichiometry, Solution Chemistry, and Acids and Bases

  2. Lesson 89: Drip Drop • Titration

  3. ChemCatalyst • A student mixes 100 mL of 0.10 M HCl with different volumes of 0.10 M NaOH. • 1: 100 mL of 0.10 M HCl + 50 mL of 0.10 M NaOH • 2: 100 mL of 0.10 M HCl + 100 mL of 0.10 M NaOH • 3: 100 mL of 0.10 M HCl + 150 mL of 0.10 M NaOH • a. Which solution is the least toxic? • b. Are the final solutions acid, basic, or neutral?

  4. Key Question • How can a neutralization reaction help you figure out acid or base concentration?

  5. You will be able to: • explain and complete a titration procedure • use titration data to determine the molarity of a solution whose concentration is unknown

  6. Prepare for the Lab • Work in pairs. • Wear safety goggles at all times. • Acids and bases are corrosive. Do not get any on skin or near eyes. • In case of a spill, rinse with large amounts of water.

  7. Discussion Notes • The chemical equation for the neutralization reaction shows the ratio in which the substances combine. • HCl(aq) + NaOH(aq)  NaCl(aq) + H2O(l)

  8. Discussion Notes (cont.) • A titration is a procedure in which a neutralization reaction is monitored with an indicator allowing you to calculate the unknown concentration of an acid or base. • When the equivalence point is reached in a titration between a strong acid and a strong base, the number of moles of H+ ions equals the number of moles of OH– ions.

  9. Wrap Up • How can a neutralization reaction help you figure out acid or base concentration? • A titration is a procedure that allows you to calculate the unknown concentration of an acid or a base using a neutralization reaction. • During a titration, an indicator is used to signal when the equivalence point has been reached.

  10. Check-In • A beaker has 50 drops of HCl, along with a drop of phenolphthalein indicator. • After 100 drops of 0.10 M NaOH are added, the color changes from clear to bright pink. What is the concentration of the original HCl solution?

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