Acid-Base Titration & pH Chapter 15B

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Acid-Base Titration & pH Chapter 15B West Valley High School General Chemistry Mr. Mata

Titration Sample Problem #1 Calculate the concentration (molarity) of an HCl solution determined by titration to which 50 mL of the acid is added to a flask. Indicator is added, and 29.6 mL of 0.967 M NaOH are required to reach the end point. MaVa = MbVb -> Ma = MbVb Va Ma = ? M Va = 50 mL Mb = 0.967 M Vb = 29.6 mL Ma = Mb Vb = (0.967 M) (29.6 mL) = 0.57 M Va 50 mL

Titration Sample Problem #2 How much 3.5 M NaOH is required to neutralize 75 mL of 12 M HCl? MaVa = MbVb -> Vb = MaVa Mb Ma = 12 M Va = 75 mL Mb = 3.5 M Vb = ? mL Vb = Ma Va = (12 M) (75 mL) = 257.1 mL Mb 3.5 M

Titration Sample Problem #3 An 80 mL sample of KOH was titrated to the endpoint with 39 mL of 6.5 M HCl. What was the molarity of the KOH? MaVa = MbVb -> Mb = MaVa Vb Ma = 6.5 M Va = 39 mL Mb = ? M Vb = 80 mL Mb = Ma Va = (6.5 M) (39 mL) = 3.2 M Vb 80 mL

Titration Sample Problem #4 How much 2.8 M Ca(OH)2 is necessary to titrate 44 mL of 0.75 M H2SO4 solution to the endpoint? MaVa = MbVb -> Vb = MaVa Mb Ma = 0.75 M Va = 44 mL Mb = 2.8 M Vb = ? mL Vb = Ma Va = (0.75 M) (44 mL) = 11.8 mL Mb 2.8 M

Chapter 15 SUTW Prompt Describe how titration and indicators are used to find the molarity of unknown solutions. Complete a 8 -10 sentence paragraph using the SUTW paragraph format. Hilight using green, yellow, and pink. Due Date: Monday, February 26, 2018 (start of class).