Question

Review Constants Periodic Table Part B A bitration is a procedure for determining the concentration of a solution by allowing it to react with another solution of known concentration called a standard solution) Acid-base reactions and oxidation-reduction reactions are used in rations For example, to find the concentration of an HCL solution (an acid), a standard solution of NGOH base) is added to a mored volume of HCl from calibrated tube called a buret. Aninditori present and it will change color when the chas rooted. Using the concentration of the standard solution and the volume dispensed, we can calcune molarity of the HCl solution Redox tations are used to determine the amounts of oxiding and reducing agents in solution For example, a solution of hydrogen peroxide,H,O, can be fitted against a solution of potassium permanganato KMnO The following equation represents the reaction: 2KMnO (aq) +H.O.(g) + 3H2SO4()- 30,() + 2MSO.(aq) + K,80.() + 4H,O(1) A certain amount of hydrogen peroxide was dissolved in 100 mL of water and thened with 1.60 M KMO What mass of HO, was dissolved if the litration required 203 ml. of the KMnO solution? Express your answer with the appropriate units. View Available Hints) HAOB? mass of H.0,- Value Units Submit Previous Answers

Answer 1

Solution : Oxidation half - reaction : H,02(aq) 02(3)+2H* (aq) + 2e Reduction half - reaction : MnO,- (aq) +8H* (aq) +5e Mn2+ (aq) + 4H2O(1) Overall reaction : 5H, O, (aq) + 2MnO2 (aq) + 6H*(aq) — 2Mn2+ (aq) +50, (g)+8H,O(1) So, m ,0 = 2x Mxico. * VO. *MW3.0: Substitute as follows. 68mol/L x 20.3x10L*34.0147 g/mol Mass of H,02 = 2.90g