Phthalic acid (H,C3H,O4, abbreviated H,Ph) is a diproticacid. Its ionization in water at 25°C_takes place in twosteps:H¿Ph(aq) + H20(e)=H;0* (aq) + HPH¯(aq)Ka1 = 1.26 × 10~³%3DHPH¯(aq) + H,O(e)2H;0*(aq) + Ph² (aq)K223.10 × 10¬6 If 0.0100 mol of phthalic acid is dissolved per liter ofwater, calculate the equilibrium concentrations of H,Ph,HPH¯, Ph²-, and H;O*.

Given: H2Phaq+H2Ol⇌H3O+aq+HPh-aq…

Answered: Phthalic acid (H,C3H,O4, abbreviated…

Chemistry: Principles and Practice

3rd Edition

ISBN:9780534420123

Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer

Chapter15: Solutions Of Acids And Bases

Section: Chapter Questions

Problem 15.31QE

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The pH scale for acidity is defined by pH – log10 H*| where |H*| is the concentration of hydrogen ions measured in moles per liter (M). (A) The pH of Drano is 13.3. Calculate the concentration of hydrogen ions in moles per liter (M). [H*] = M (B) The pH of rain water is 5.5. Calculate the concentration of hydrogen ions in moles per liter (M). [H*] = M
(i) Define pH in words. The strong acid HClaq has a pH value of 1, use the following equation for a strong acid: HClaq à H+aq + Cl-aq and convert the following expression to deduce the hydrogen ion concentration: pH = -log10 [H+] (ii) Use the above expression to deduce the pH of HCl (aq) given the concentration of the acid to be 4.5 mol/dm3 pH =
(i) Define pH in words. The strong acid HClaq has a pH value of 1, use the following equation for a strong acid: HClaq à H+aq + Cl-aq and convert the following expression to deduce the hydrogen ion concentration: pH = -log10 [H+] (ii) Use the above expression to deduce the pH of HCl (aq) given the concentration of the acid to be 4.5 mol/dm3

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