Question

Chem 136 F19 In-Class Exercise 6 (5 pts) Chapter 16-17 Acid-Base Equilibria Date Name Instructions: To receive full credit of this assignment, you should list the quantities given and provide your calculations in details including correct number of significant figures and units for intermediate steps and final results. You are given a sample containing oxalic acid (C,H,O, or HOOC-COOH). Oxalic acid is a common acid found in vegetable and fruit. Its chemical structure is given below. The content of oxalic acid can be determined by acid-base titration. 15.47 mL of a standard solution of potassium hydroxide (KOH, 0. 2837 M) is used to completely neutralized 25.00 mL of oxalic acid in the sample. Calculate the concentration (in M) of oxalic acid in the sample. OH Given: Mb Vb = Va (1) Write the balanced chemical equation involving in the titration: (2) Calculate the concentration (in M) of oxalic acid in the sample

Answer 1

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Q I As con seen from structure oxalic Ared is dep sotic Acid so 2 males of kohare consumed per male of oxalic Acid.. C2 H₂ O 4 Cog) + 2KOH C₂ Oy K2 + 2H2O HOOG-COOH + 2 koH > K+80c-cookt + 2H2O ag) @2) Now Mo Nivi= Nz V2 As koH for Koh Malarity= Normality IN,= Normality of And as basicity is Vi= Volume of And N2 - Normality of NX 25.0me = 0.2837NX 15.4me vase V2 = Volume of lase Ni = 0.1755 N And 2x Normality For oxalic And = Malarity # As oxalic And is dipsotic Malarity = 2 x 0,1755 = 0.35M Ang