eqreq2req#3How many moles of potassium hydroxide would have to be added to 250 mL of a 0.321 M acetic acid solution, inorder to prepare a buffer with a pH of 4.540?80EDSubmit AnswerC54$RLLF%Retry Entire Group 6 more group attempts remaining5VUse the References to access important values if needed for this question.$Cengage Learning | Cengage Technical SupportTG^6BMacBook ProYH&7NU* 008moles▶▶1M(9KK01)0LÝPPreviousEmail Instructor)){+ 11[=O1Next>Save and Exit}de

Moles of potassium hydroxide solution can be calculated using the Henderson hasselbalch equation.

Answered: How many moles of potassium hydroxide…

How many moles of potassium hydroxide would have to be added to 250 mL of a 0.321 M acetic acid solution, in order to prepare a buffer with a pH of 4.540? moles

World of Chemistry, 3rd edition

3rd Edition

ISBN:9781133109655

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

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

Chapter16: Acids And Bases

Section: Chapter Questions

Problem 50A

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Concept explainers

Solutions

Solutions can be considered as homogeneous mixtures which contain two or more than two chemical substances. The chemical substance which is the greater part is defined as solvent. And the chemical substance that is dissolved in a solvent is referred to as solute. Solution chemistry plays an important role in chemistry since it supports many commercial applications of solutions.

Question

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A solution is made by dissolving 15.0 g sodium hydroxide in approximately 450 mL water. The solution becomes quite warm, but after it is allowed to return to room temperature, water is added to bring the volume to 500.0 mL of solution. (a) Calculate the pH and pOH in the final solution. (b) Why would we wait for it to return to room temperature? (c) If the mass of the water used to initially dissolve the sodium hydroxide were exactly 450 g and the temperature of the water increased by 8.865 C, how much heat was given off by the dissolution of 15.0 g of solute? Assume the specific heat of the solution is 4.184 J/g. K. What is the molar heat change for the dissolution of sodium hydroxide (known as the enthalpy of solution, Hsol)?
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