What is the approximate pH at the equivalence point of a weak base-strong acid titration if 50.00 mL of aqueous ammonia (NH3) requires 37.10 mL of 0.1087 mol L-1 HCI? pK₁ =4.75 for ammonia. Report your answer in 2 decimal places.

What is the approximate pH at the equivalence point of a weak base-strong acid titration if 50.00 mL of aqueous ammonia (NH3) requires 37.10 mL of 0.1087 mol L-1 HCI? pK₁ =4.75 for ammonia. Report your answer in 2 decimal places.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

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Concept explainers

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.

Question

What is the approximate pH at the equivalence point of a weak base-strong acid
titration if 50.00 mL of aqueous ammonia (NH3) requires 37.10 mL of 0.1087 mol
L-1 HCI? pK₁ =4.75 for ammonia. Report your answer in 2 decimal places.

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Step 1: Given data

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Step 2: Calculation of molarity of ammonia

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Step 3: Calculation of moles of ammonia and HCl and total volume

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Step 4: Determination of ICE table and new molarity calculation

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Step 5: Determination of ICE table

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Step 6: Calculation of Ka value

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Step 7: Calculation of hydrogen ion concentration

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Step 8: Calculation of pH value

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