UB CHE 102LLR - Test_2_Review (5 pages)

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Test_2_Review



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Test_2_Review

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Pages:
5
School:
University at Buffalo-SUNY
Course:
Che 102llr - General Chemistry
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Chemistry 102 REVIEW QUESTIONS Test 2 1 Calculate the pH of a 1 8 M solution of methyl amine CH3NH2 Kb 4 38 x 10 4 2 Calculate the pH of a solution prepared by adding 40 0 mL of 0 10M NH3 to 20 0 mL of water Kb of NH3 1 8x10 5 3 Calculate the pH of a solution resulted from mixing 200 mL of HCl solution pH 3 00 with 100 mL of HCl solution pH 2 00 4 How many grams of ammonia are needed to make 1 25 L solution with a pH of 11 68 Kb of NH3 1 8x10 5 1 5 The solubility of CO2 g in pure water is 0 0037 mol L Assuming that dissolved CO2 is in the form of H2CO3 aq what is the pH of a 0 0037 M solution of dissolved CO2 Ka1 for H2CO3 4 3 x 10 7 6 Calculate the pH of a 7 5x10 6 M solution of Mg OH 2 7 Phenol C6H5OH has a Ka value of 1 6 x 10 10 What is the Kb value for phenoxide ion C6H5O 8 A benzoic acid solution C6H5CO2H has a pH of 2 80 Given that Ka of benzoic acid is 6 4x10 5 calculate the concentration and percent dissociation of this acid 2 9 Determine the pH of a 0 10 M NaCN solution 10 Write net ionic equations for the reactions that take place when aqueous solutions of the following substances are mixed a sodium cyanide and nitric acid b potassium hydrogen sulfate and lithium acetate 11 Based on molecular structure choose the stronger acid in each pair Explain your reasoning a H2S or H2Se b HClO2 or HClO c H2SO4 or H2SeO4 d CCl3CO2H or CH3CO2H 12 For each pair given below determine which is more basic Assume the same concentration for all solutions a Solution of NaClO and solution of HF b Solution of KCl and solution of KClO2 c Solution of NH4Cl and solution of HCN 3 13 Calculate the pH and CN in a solution that is 0 050 M HC2H3O2 and 0 050 M HCN Ka acetic acid 1 8x10 5 and Ka HCN 4 9x10 10 Note Concentration of acids given are after mixing 14 Complete the reaction shown below and determine whether the forward reaction or the reverse reaction is favored HNO2 F 15 What is the change in pH if H3O changes by each of the following factors a 1000 b 1 0x105 c 2 0 4 ANSWERS 1 12 45 2 11 04 3 2 40 4 27 2 g 5 4 40 6 9 18 7 6 3x10 5 8 4 1 9 11 15 10 No answers provided 11 a H2Se Se larger than S causing acid bond to be weaker b HClO2 The greater number of oxygens cause more polar acidic bond c H2SO4 Sulfur is more electronegative than Se causing the acid bond to be more polar d CCl3CO2H the 3 electronegative chlorine atoms withdraw electrons from the oxygen in turn causing the acidic bond to become more polar 12 No answers given 13 pH 3 02 CN 2 6x10 8 14 No answers provided 15 a 3 b 5 c 0 3 5


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