2 Stoichiometry overview Recall that in stoichiometry the mole ratio provides a necessary conversion factor:grams (x) moles (x) moles (y) grams (y)molar mass of xmolar mass of ymole ratio from balanced equationWe can do something similar with solutions:volume (x) moles (x) moles (y) volume (y)mol/L of xmol/L of ymole ratio from balanced equationRead pg Try Q 1-3a.
3 Pg. 353, Question 1Ammonium sulfate is manufactured by reacting sulfuric acid with ammonia. What concentration of sulfuric acid is needed to react with 24.4 mL of a 2.20 mol/L ammonia solution if 50.0 mL of sulfuric acid is used?H2SO4(aq) + 2NH3(aq) (NH4)2SO4(aq)Calculate mol H2SO4, then mol/L = mol/ L# mol H2SO4=2.20 mol NH3L NH3x1 mol H2SO42 mol NH3xL NH3mol H2SO4=mol/L = mol H2SO4 / L = mol/L
4 Al2(SO4)3(aq) + 3Ca(OH)2(aq) 2Al(OH)3(s) + 3CaSO4(s) Pg. 353, Question 2Calcium hydroxide is sometimes used in water treatment plants to clarify water for residential use. Calculate the volume of mol/L calcium hydroxide solution that can be completely reacted with 25.0 mL of mol/L aluminum sulfate solution.Al2(SO4)3(aq) + 3Ca(OH)2(aq) 2Al(OH)3(s) + 3CaSO4(s)# L Ca(OH)2=L Al2(SO4)30.125 mol Al2(SO4)3L Al2(SO4)3x3 mol Ca(OH)21 mol Al2(SO4)3xL Ca(OH)2mol Ca(OH)2x= L Ca(OH)2
5 2FeCl3(aq) + 3Na2CO3(aq) Fe2(CO3)3(s) + 6NaCl(aq) Pg. 353, Question 3A chemistry teacher wants 75.0 mL of mol/L iron(Ill) chloride solution to react completely with an excess of mol/L sodium carbonate solution. What volume of sodium carbonate solution is needed?2FeCl3(aq) + 3Na2CO3(aq) Fe2(CO3)3(s) + 6NaCl(aq)# L Na2CO3=L FeCl30.200 mol FeCl3L FeCl3x3 mol Na2CO32 mol FeCl3xL Na2CO30.250 mol Na2CO3x= L Na2CO3 = 90.0 mL Na2CO3
8 AssignmentH2SO4 reacts with NaOH, producing water and sodium sulfate. What volume of 2.0 M H2SO4 will be required to react completely with 75 mL of 0.50 mol/L NaOH?How many moles of Fe(OH)3 are produced when 85.0 L of iron(III) sulfate at a concentration of mol/L reacts with excess NaOH?What mass of precipitate will be produced from the reaction of 50.0 mL of 2.50 mol/L sodium hydroxide with an excess of zinc chloride solution.
9 Assignmenta) What volume of 0.20 mol/L AgNO3 will be needed to react completely with 25.0 mL of 0.50 mol/L potassium phosphate?b) What mass of precipitate is produced from the above reaction?What mass of precipitate should result when L of mol/L aluminum nitrate solution is mixed with L of 1.50 mol/L sodium hydroxide solution?
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