1. Steps for solving titration problems
Balanced neutralization equation
Volume & concentration of base -> mols OH-
mols OH- to mols H3O+
mols H3O+ to mols acid
mols acid & volume acid to concentration of acid

2. Practice Titration Problem
In a titration, 27.4 mL of M barium hydroxide solution is added to a 20.0 mL sample of hydrochloric acid solution of unknown concentration. What is the molarity of the acid solution?

3. 1) Ba(OH)2 + 2 HCl -> BaCl2 + 2H2O
2) 27.4mLBa(OH)2 x L Ba(OH) x molBa(OH)2 x
1000mLBa(OH) L Ba(OH)2
2 mol OH = x 10-4 mol OH-
1 mol Ba(OH)2
3) x 10-4 mol OH- = x 10-4 mol H3O+
4) x 10-4 mol H3O+ x mol HCl = x 10-4 mol HCl
1 mol H3O+
5) M = mol/L, so ...
x 10-4 mol HCl / L HCl
Final Answer:
M HCl