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Safari File Edit View History Bookmarks Window Help Safari File Edit ViewHistory Bookmarks Window Help Tue 1:31 PM Roy Aldrich a E 82%; Do court survey Do community service Do college essays Mango for French Do mastering chemistry Government Quiz Economics Homework session.masteringchemistry.com CHEM 1411 Fall 2015 Help Close Resources ! « previous 11 of 22 next » ost Lecture Homework Chapter ± Titrations and Solution Stoichiometry le Submit survey for 10 hours of comm service Submit 12 hours at some Titrations and Solution Stoichiometry Part A A volume of 40.0 mL of aqueous potassium hydroxide (KOH) was titrated against a standard solution of sulfuric acid (H2SO4) What was the molarity of the KOH solution if 17.2 mL of 1.50 M H2SO4 was needed? The equation is Pay $205 A titration 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 titrations. For example, to find the concentration of an HCl solution (an acid), a standard solution of NaOH (a base) is added to a measured volume of HCl from a calibrated tube called a buret. An indicator is also present and it will change color when all the acid has reacted. Using the concentration of the standard solution and the volume dispensed, we can calculate molarity of the HCl solution. 2KOH(aq) + H2SO1(aq)K2SO4 (aq)--2H20(1) Give Senior Picture deposit(S35) Windows Surface($1000) Save money for a car($2000 deposit) Get glasses($180) Get passport($110) es Express your answer with the appropriate units. IA 0 Plan Javi's birthday stutf molarityValuUnits Submit Hints My Answers Give Up Review Part Part B Redox titrations are used to determine the amounts of oxidizing and reducing agents in solution. For example, a solution of hydrogen peroxide. H22 , can be titrated against a solution of potassium permanganate, KMnO4 The following equation represents the reaction: df 2KMnO4 (aq) + H2O2 (aq) + 3H2so, (aq)- 302(8) +2MnSO4(aq) +K2SO4(aq)+4H2O(l) A certain amount of hydrogen peroxide was dissolved in 100. mL of water and then titrated with 1.68 M KMnO4. What mass of H2 02 was dissolved if the titration required 21.8 mL of the KMnO solution? Express your answer with the appropriate units. LA 0 mass o 1,02= Value Units 29 844s

Explanation / Answer

PART A

1 mol of acid requires 2 mol of base

calculate moles of acid used

M*V = mol of acid

1.5*17.2 = 25.8 mmol of acid used

we require 2x that

25.8*2 = 51.6 mmol of base

M = mmol / ml = 51.6 mmol/40 = 1.29 M of KOH

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