Q2 Online HW 2

# Q2 Online HW 2 - Question 1(Name:Arshi Imtiaz When KF is...

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(Name:Arshi Imtiaz) When KF is added to water, the conjugate acid is: H 3 O + H + F - F 2 H 2 O HF Question 2 In the following reaction, identify the Lewis acid. Fe 3+ ( aq ) + 6 CN - ( aq ) <==>Fe(CN) 6 3- ( aq ) Fe 3+ CN - Fe(CN) 6 3- OH - H + Question 3 Calculate the hydronium-ion concentration at 25 o C in a 1.3 x 10 -3 M HBr solution. 1.5 x 10 3 M 3.8 x 10 -12 M 2.6 x 10 -3 M 1.3 x 10 -3 M 7.7 x 10 -12 M 1.5 x 10 -3 M Question 4 Calculate the pH of a solution that contains a [H 3 O + ] = 8.23 x 10 -3 M -11.92 1.975 2.085 4.622 -2.085 11.92 Question 5 9.64 grams of KOH is completely dissolved in 37.3 L of deionized water at 25 o C. What is the pH of the solution? 10.73 1.752 3.802 10.63 2.337 2.058 11.66 11.10 Question 6 A stock solution is made by dissolving 23.1 grams of HBr in 161 L of deionized water. If you need to prepare 460. L of a pH 6.353 solution, how many liters of the original stock solution would you need to use? 0.124 L 0.109 L 0.125 L 0.111 L 0.115 L 0.110 L Question 7 An aqueous solution has a pH of 13.15 at 25 o C. Is the solution acidic, neutral, or basic? acidic basic neutral Question 8 K a for the weak acid, HA, is 2.0 x 10 -6 at a certain temperature. What is the pH of a 0.696 M solution of the acid at this temperature? Question 9

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Q2 Online HW 2 - Question 1(Name:Arshi Imtiaz When KF is...

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