FALL2006 Exam 2

FALL2006 Exam 2 - CHEM 109 EXAM 2 FALL 2006 SHOW ALL WORK...

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CHEM 109 EXAM 2 FALL 2006 – SHOW ALL WORK – NO WORK – NO CREDIT 1. (15 pts) (a) Household bleach is an aqueous solution of sodium hypochlorite (NaClO, MM = 74.442 g/mol). What is the molarity of a bleach solution containing 17.8 g of sodium hypochlorite in a total volume of 455 mL? __________ M (b) Muriatic acid, an industrial grade of concentrated HCl, is used to clean masonry and etch cement prior to painting. What volume of 11.7 M muriatic acid is required to make 15.0 L of a 3.4 M acid solution? __________ L (c) Citric acid, H 3 C 6 H 5 O 7 , in orange juice may be neutralized by sodium hydroxide according to the equation below. A 1.25 L sample of orange juice required 6.67 mL of a 0.025 M solution of NaOH to reach the equivalence point. What was the molarity of the citric acid in the orange juice sample? H 3 C 6 H 5 O 7 ( aq ) + 3 NaOH ( aq ) → Na 3 C 6 H 5 O 7 ( aq ) + 3 H 2 O ( l ) citric acid __________ M 2. (10 pts) The iron salt formed from the two reactants shown below is sometimes used to treat polluted water. Write the balanced molecular, complete ionic, and net ionic equations for the following reaction: iron(II) chloride ( aq ) + NaOH ( aq ) → ? balanced molecular equation: _______________________________ _____________________________ balanced ionic equation: ____________________________________ _____________________________ balanced net ionic equation: _______________________________ _____________________________ 1
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CHEM 109 EXAM 2 FALL 2006 – SHOW ALL WORK – NO WORK – NO CREDIT 3. (10 pts) (a) What is the oxidation number of the phosphorus atoms in H 2 P 2 O 7 2– . (b)
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This test prep was uploaded on 04/12/2008 for the course CHEM 109 taught by Professor Malina during the Spring '08 term at UNL.

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FALL2006 Exam 2 - CHEM 109 EXAM 2 FALL 2006 SHOW ALL WORK...

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