When A Solution Of Acetic Acid Was Titrated With NaOH Class 11 ...

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• When a solution of acetic acid...

AnswerQuestion Answers for Class 12Class 12 BiologyClass 12 ChemistryClass 12 EnglishClass 12 MathsClass 12 PhysicsClass 12 Social ScienceClass 12 Business StudiesClass 12 EconomicsQuestion Answers for Class 11Class 11 EconomicsClass 11 Computer ScienceClass 11 BiologyClass 11 ChemistryClass 11 EnglishClass 11 MathsClass 11 PhysicsClass 11 Social ScienceClass 11 AccountancyClass 11 Business StudiesQuestion Answers for Class 10Class 10 ScienceClass 10 EnglishClass 10 MathsClass 10 Social ScienceClass 10 General KnowledgeQuestion Answers for Class 9Class 9 General KnowledgeClass 9 ScienceClass 9 EnglishClass 9 MathsClass 9 Social ScienceQuestion Answers for Class 8Class 8 ScienceClass 8 EnglishClass 8 MathsClass 8 Social ScienceQuestion Answers for Class 7Class 7 ScienceClass 7 EnglishClass 7 MathsClass 7 Social ScienceQuestion Answers for Class 6Class 6 ScienceClass 6 EnglishClass 6 MathsClass 6 Social ScienceQuestion Answers for Class 5Class 5 ScienceClass 5 EnglishClass 5 MathsClass 5 Social ScienceQuestion Answers for Class 4Class 4 ScienceClass 4 EnglishClass 4 MathsWhen a solution of acetic acid was titrated with NaOH, the pH of the solution when half the acid neutralized was 4.74. Dissociation constant of the acid is:(a) \[1.8\text{ x }{{10}^{-5}}\](b) \[3.2\text{ x }{{10}^{-5}}\](c) \[8.7\text{ x }{{10}^{-8}}\](d) \[6.42\text{ x }{{10}^{-4}}\]AnswerVerified606k+ viewsHint: Acetic acid is a weak acid and sodium hydroxide is a strong base. This will react together to give salt and water. A solution consisting of a weak acid and its salt with a strong base is known as an acid buffer. Use the relation between pH and dissociation constant to find the same.Complete step by step answer:According to the question, we have been provided with the following data –A solution of acetic acid is titrated with Sodium Hydroxide (NaOH). This gives two products – sodium acetate and water. The reaction can be written as –\[C{{H}_{3}}COOH+NaOH\rightleftharpoons C{{H}_{3}}COONa+{{H}_{2}}O\]When a weak acid and strong base react, it gives salt and water, which is mildly basic in nature. This type of reaction is known as a neutralization reaction and the medium is known as an acidic buffer. For acidic buffers, the value of pH can be written as – pH = pKa + log([salt] / [acid])where, pKa = -log (Ka)Ka = dissociation constant[salt] = concentration of salt (mol/L)[acid] = concentration of weak acid (mol/L)In the above reaction, we can see that 1 mole of acid (acetic acid) reacts with 1 mole of base (sodium hydroxide) of given 1 mole of salt (sodium acetate) and water respectively. Given, half the acid was neutralized, therefore, 0.5 mole of acid was used and 0.5 mole of salt will be produced. Therefore, we can assume the concentration of salt = acid = 0.5 = cSo, we can calculate the value of pH as –pH = pKa + log([salt] / [acid])pH = pKa + log (c / c)pH = pKa + log 1since log 1 = 0, the equation becomes,pH = pKa Given, pH of the solution = 4.74Therefore, pKa = 4.74- log Ka = 4.74log Ka = - 4.74Ka = \[\text{ }{{10}^{-4.74}}\]Dissociation constant = Ka = \[1.8\text{ x }{{10}^{-5}}\]Therefore, the answer is – option (a).Note: A basic buffer solution consists of a mixture of a weak base and its salt with strong acid. For example – a mixture of ammonium hydroxide and ammonium chloride. We can relate pOH and dissociation constant for a base by the equation –pOH = pKb +log([salt] / [base]).Recently Updated PagesBasicity of sulphurous acid and sulphuric acid areMaster Class 11 Business Studies: Engaging Questions & Answers for SuccessMaster Class 11 Computer Science: Engaging Questions & Answers for SuccessMaster Class 11 Economics: Engaging Questions & Answers for SuccessMaster Class 11 Social Science: Engaging Questions & Answers for SuccessMaster Class 11 English: Engaging Questions & Answers for SuccessBasicity of sulphurous acid and sulphuric acid areMaster Class 11 Business Studies: Engaging Questions & Answers for SuccessMaster Class 11 Computer Science: Engaging Questions & Answers for SuccessMaster Class 11 Economics: Engaging Questions & Answers for SuccessMaster Class 11 Social Science: Engaging Questions & Answers for SuccessMaster Class 11 English: Engaging Questions & Answers for Success

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