Solution Stoichiometry

Solution Stoichiometry

• We have already explored gravimetric stoichiometry (mass-to-mass)

• However, most industrial reactions take place in solution– Easier to manipulate and control– Many chemical reactions only occur if the reactants

are in solution

• Solution stoichiometry (or volumetric stoichiometry) is a method of calculating the concentration of substances in solution

Steps to Solving Solution Stoichiometry Problems

1. Write the balanced chemical equation2. Set up a stoich table

OR

1. Write the balanced chemical equation2. Convert given values to moles3. Use the mole ratio to solve for unknowns

Example: A 10.00 mL sample of sulfuric acid reacts completely with 15.9 mL of a 0.150 mol/L potassium hydroxide solution. Calculate the molar concentration of the sulfuric acid.

H2SO4(aq) + 2 KOH(aq) 2 H2O(l) + K2SO4(aq)

C = 1.193 X 10-3 mol

0.01000 L

= 0.119 mol/L

0.150 mol/L

n= 2.385 X 10-3 molKOH X 1 molH2SO4

2 molKOH

= 1.193 X 10-3 molH2SO4

= 0.150 mol X 0.0159 L

1 L

= 2.385 X 10-3 mol

V 0.01000 L 0.0159 L

Practice!

• P. 353 #1-3

• Worksheet

• Review: p. 358 #1-3,5,9,10