# Sample Exam # 2 – 3 Part 2: Problems and Written Answers: Show all work in a neat, logical, and complete set-up. Give the equilibrium equation and

Number 13: what is the iron (ii) concentration at equilibrium?

Sample Exam # 2 – 3Part 2: Problems and Written Answers: Show all work in a neat, logical, and complete set-up. Givethe equilibrium equation and the mass action expression for all equilibrium problems. Show all necessunits and use the correct number of significant figures throughout.not.12. Which of the following mixtures would make a buffer solution? In each case, explain why or whya) 40 mL of 0.12 M HCNO plus 30 mL of 0.15 M KCNOb) 25 mL of 0.10 M HI plus 25 mL of 0.10 M Nalc) 32 mL of 0.20 M NH3 plus 15 mL of 0.20 M HCI13. (7 pts) A 50.0 mL sample of 0.180 M Fe(NO3)2 is added to 50.0 mL of 2.0 M NaCN. What is theiron(II) ion concentration in this system at equilibrium?14. (6 pts) The measured pH of a saturated Ca(OH)2 solution is 12.35. Calculate the experimental valfor the Ksp of calcium hydroxide.15.(12 pts) a) How many grams of solid ammonium chloride must be added to 250. mL of 0.500 Maqueous ammonia to give a buffer with a pH of 9.40? (assume no change in volume)b) If 2.00 mL of 3.00M nitric acid is added to 50.0 mL of the buffer prepared in part a), what will bepH of the resulting solution?

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