Problem 4 It takes 0.50 moles of Br,0) to titrate 25.0 mL of H,S,0,(aq) in the reaction: + 4Br, + 5H,0 2so- + 8Br + 10H* What is the molar concentration of H,S,0,? Enter your answer in the box provided with correct units and sig. figs.:

Question A 25.0 mL volume of 0.0400 M phosphoric acid (H3PO4, pK1 = 2.15; pK2 = 7.20; pK3 = 12.38) was titrated with 0.0500 M tetramethylammonium hydroxide. The titration reactions between the acid and the strong base are H;PO4 + OH → H,POT +H20 H,PO, +OH" + HPO-+ H20 HPO-+OH" → Po-+H20 What is the pH of the solution after 20 mL of the titrant was added? Answer 4.68

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Question 2 of 6 Submit Write the balanced NET ionic equation for the reaction when aqueous BaCl, and aqueous (NH,)2SO, are mixed in solution to form aqueous NH,Cl and solid BaSO4. 3C,2- Reset 1 2 3 4 5 6. 7 8 9 + (s) (1) (g) (aq) H Ba S CI • x H2O Tap here or pull up for additional resources

QUESTION 8 A student prepared benzoic acid using the method described in the procedure using 4.05 g KMnO4, 2.00 mL benzyl alcohol and 150 mL 3.0M H₂SO4- How many molar equivalences of hydrogen ions were added to the reaction?