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H6_FALL 2010

H6_FALL 2010 - C 111 FALL 2010 Homework 6 Name DREW...

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C 111 FALL 2010 Homework 6 Name: DREW RASMUSSEN Due: Wednesday, October 20 by 5 pm. 10 pts total Show set-up for all computations. No credit will be given for answers with no work. 1. (1 pt) The amount of calcium ion in hard water can be found by titration with EDTA (abbreviated Y 4− ). A 25.00-mL water sample of unknown Ca 2+ concentration was titrated to the end point by 47.91 mL of 0.0573 M EDTA standard solution. What is the concentration of Ca 2+ in the water? The balanced chemical equation is Ca 2+ + Y 4- CaY 2- 2. (1 pt) A 1.11498 g sample of a solid monoprotic organic acid is dissolved in 50.00 mL water and titrated to the equivalence point using 43.75 mL of 0.08974 M NaOH. (a) How many moles of the acid were in the sample? (b) Calculate the molar mass of this organic acid. moles of acid = molar mass of acid =
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3. (1 pt) Water can be formed in the gas phase from O 2 (g) and H 2 (g) according to the following equation: 2 H 2 (g) + O 2 (g) 2 H 2 O (g) How many mL of O 2 would be required to completely react with 22.5
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H6_FALL 2010 - C 111 FALL 2010 Homework 6 Name DREW...

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