Explanation Formula used: p K b = − log ( k b ) pOH = pKb + N ( log [ C 5 H 5 N H + ] C 5 H 5 N ) Ka = Kw Kb Calculation: The molecular formula of pyridine is C 5 H 5 N The base dissociation constant, Kb of C 5 H 5 N = 1.7 × 10 − 9 pKb = − log 1.7 × 10 − 9 = 8.77 Volume of pyridine = 25.0 m L = 0.0250 L Moles of C 5 H 5 N = 0.0250 L x 0.125 M = 0.00313 The pH at 0mL of added HCL: At 0mL only pyridine is present in the water. Kb= 1.7 × 10 − 9 When 25mL of 0.125 M pyridine is tritrated: B + H 2 0 ⇌ HB + + OH − From this equation we know the Kb value can be calculated as Kb = [ HB + ] [ OH − ] [ B ] = x 2 0.125 − x 1.7 × 10 − 9 = x 2 0.125 − x Since we know that x is small we can ignore x . There fore, [ OH − ] = x = ( 1.7 × 10 − 9 ) ( 0.125 ) = 1.458 × 10 − 5 pOH = − log [ OH ] = 4.836 pH = 14 − 4.836 = 9.164 The pH at 10mL of added HCL: Moles of added HCL = 0.010 L × 0.100 M = 0.001 Moles formed = 0.001 Moles of pyridine in excess = 0.00313 – 0.001 = 0.00213 Total volume = 0.035 L Concentration of C 5 H 5 N = ( 0.00213 0.035 L ) = 0.061 M Concentration of C 5 H 5 N H = ( 0.00100 0.035 L ) = 0.029 M From Handerson-Hasselbalch equation, pOH = pKb + ( log [ C 5 H 5 N H + ] C 5 H 5 N ) pOH = 8.77 + ( log 0.029 0.061 ) = 8.447 pH = 14 − pOH = 14 – 8.447 = 5.553 The pH at 20mL of added HCL: Moles of added HCL = 0.020 L × 0.100 M = 0.002 Moles formed = 0...

Chemistry: Structure And Properties, Books A La Carte Edition (2nd Edition)

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ISBN: 9780134528229

Author: Nivaldo J. Tro

Publisher: PEARSON

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Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.

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Chapter 17, Problem 72E

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To determine:

To calculate the pH at 0 mL, 10 mL, 20 mL of added acid, equivalent point, one half equivalent point and at 40 mL and 50 mL of added acid.

To sketch the titration curve

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Chapter 17, Problem 71E

Chapter 17, Problem 73E

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Chemistry: Structure And Properties, Books A La Carte Edition (2nd Edition)

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To calculate the pH at 0 mL, 10 mL, 20 mL of added acid, equivalent point, one half equivalent point and at 40 mL and 50 mL of added acid. To sketch the titration curve

Solution Summary: The author calculates the pH of pyridine without any added acid from the ionization equation of the reaction.

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To determine: To calculate the pH at 0 mL, 10 mL, 20 mL of added acid, equivalent point, one half equivalent point and at 40 mL and 50 mL of added acid. To sketch the titration curve

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Chapter 17 Solutions

To determine:

To calculate the pH at 0 mL, 10 mL, 20 mL of added acid, equivalent point, one half equivalent point and at 40 mL and 50 mL of added acid.

To sketch the titration curve