#14 and #15 on the homework due 12/19

14. 

2 H₃PO₄ + 3 Ca(OH)₂   à  Ca₃(PO₄)₂ + 6 H₂O

0.75 L x (6 mol/L) = 4.5 mol H₃PO₄

4.5 mol H₃PO₄ ∙ (6 mol H₂O/2 mol H₃PO₄) ∙ (18.0128 g H₂O/ 1 mol H₂O) = 243 g water

4.5 mol H₃PO₄ ∙ (1 mol Ca₃(PO₄)₂/2 mol H₃PO₄) ∙ (310 g Ca₃(PO₄)₂/1 mol Ca₃(PO₄)₂) = 698 g calcium phosphate

15. 

3 H₂SO₄ + 2 Al(OH)₃ à  Al₂(SO₄)₃ + 6 H₂O

0.250 L ∙ (2.5 mol Al(OH)₃ / 1 L) = 0.625 mol Al(OH)₃

0.625 mol Al(OH)₃ ∙ (3 mol H₂SO₄/2 mol Al(OH)₃) = 0.9375 mol H₂SO₄

18.0 = 0.9375/x    

X = 0.0521 L = 52.1 mL H₂SO₄

Writing Assignment 12/5

You have learned about two extremes of dealing with asbestos exposure.  You have watched how WR Grace executives withheld information from its workers regarding their exposure, and you have heard Mr. Barnett talk about all of the government regulation regarding asbestos in schools.  He obviously feels like these regulations are excessive.  Do you agree?  Explain your reasoning.