1. Titrations!

2. Titrations
Titration: adding a known amount of solution of known concentration to a solution with an unknown concentration
Goal: To determine the unknown concentration of a solution

3. Titrations Endpoint: the point of neutralization in a titration
How do we know we reached the endpoint in a titration?
We use an indicator and look for a color change!

4. To solve this problem, we need to use the box method!
Titration Example
A 2.5 L solution of H2SO4 is completely neutralized by 0.5 L of 1.0 M NaOH. What is the concentration of the H2SO4 solution?
In buret:
1.0 M NaOH
To solve this problem, we need to use the box method!
In Erlenmeyer flask:
? M H2SO4

5. A 2. 5 L solution of H2SO4 is completely neutralized by 0. 5 L of 1
A 2.5 L solution of H2SO4 is completely neutralized by 0.5 L of 1.0 M NaOH. What is the concentration of the H2SO4 solution?
H2SO4 + 2 NaOH  Na2SO4 + 2 H2O
Step 1: Write the balanced neutralization equation.

6. A 2. 5 L solution of H2SO4 is completely neutralized by 0. 5 L of 1
A 2.5 L solution of H2SO4 is completely neutralized by 0.5 L of 1.0 M NaOH. What is the concentration of the H2SO4 solution?
Moles (mol)
Molarity (M)
Liters (L)
1.0 M
2.5 L
0.5 L
H2SO4 + 2 NaOH  Na2SO4 + 2 H2O
Step 2: Construct the box and fill in known information.

7. H2SO4 + 2 NaOH  Na2SO4 + 2 H2O * 1.0 M 2.5 L 0.5 L 0.25 mol 0.5 mol
A 2.5 L solution of H2SO4 is completely neutralized by 0.5 L of 1.0 M NaOH. What is the concentration of the H2SO4 solution?
x 1/2
Multiply by molar ratio
Moles (mol)
Molarity (M) *
1.0 M
Liters (L)
2.5 L
0.5 L
0.25 mol
0.5 mol
0.10 M
Moving up = multiply
Moving down = divide
H2SO4 + 2 NaOH  Na2SO4 + 2 H2O
Step 3: Calculate missing information until you determine what the problem is asking you to find.

8. Titration Practice - #1 on WS
30 mL of 0.10 M NaOH is used to completely neutralize 25.0 mL of HCl. Determine the concentration of the acid.
Moles (mol)
Molarity (M)
Liters (L)

9. HCl Titration Lab – Analysis Questions
From your blue self-assessment sheet…

11. Titration Practice #1
A 1.5 L solution of HCl is completely neutralized by 2.0 L of 0.5 M Al(OH)3. What is the concentration of the HCl solution?
Moles (mol)
Molarity (M)
Liters (L)

12. Titration Practice #2
A 25 mL solution of H2SO4 is completely neutralized by mL of 1.0 M NaOH. What is the concentration of the H2SO4 solution?
Moles (mol)
Molarity (M)
Liters (L)