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. 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?
1.0 M NaOH
Show your work for each step:
1. Write the balanced neutralization reaction
2. Start with the volume of the known
3. Find the moles of your known using the volume and concentration
4. Use the molar ratio (the coefficients) to determine the unknown number of moles
? M H2SO4
5. Divide the moles by the volume to get concentration OR convert to grams

5. 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?
1. Write the balanced neutralization reaction
H2SO4 + 2 NaOH  Na2SO4 + 2 H2O
2. Start with your known volume
0.5 L of 1.0 M NaOH
3. Find the moles of your known using the volume and concentration
0.5 L NaOH x 1 mol NaOH
1 L NaOH
= 0.50 mol NaOH

6. Titration Example continued
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
4. Use the molar ratio (the coefficients) to determine the unknown number of moles
0.50 mol NaOH x 1 mol H2SO4
2 mol NaOH
= 0.25 mol H2SO4
5. Divide the moles by the volume to get concentration
0.25 mol H2SO4
2.5 L H2SO4
= 0.1 M H2SO4

7. Titration Practice
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?
0.5 M Al(OH)3
Show your work for each step:
1. Write the balanced neutralization reaction
2. Start with your known volume or mass
3. Find the moles of your known using the volume and concentration
4. Use the molar ratio (the coefficients) to determine the unknown number of moles
? M HCl
5. Divide the moles by the volume to get concentration OR convert to grams

9. Example #2
A 25 mL solution of H2SO4 is completely neutralized by 6.5 mL of 1.0 M NaOH. What is the concentration of the H2SO4 solution?
1. Write the balanced neutralization reaction
H2SO4 + 2 NaOH  Na2SO4 + 2 H2O
2. Start with your known value
L of 1.0 M NaOH
3. Find the moles of your known using the volume and concentration
L NaOH x 1 mol NaOH
1 L NaOH
= mol NaOH

10. Titration Example continued
A 25 mL solution of H2SO4 is completely neutralized by 6.5 mL of 1.0 M NaOH. What is the concentration of the H2SO4 solution?
H2SO4 + 2 NaOH  Na2SO4 + 2 H2O
4. Use the molar ratio (the coefficients) to determine the unknown number of moles
mol NaOH x 1 mol H2SO4
2 mol NaOH
= mol H2SO4
5. Divide the moles by the volume to get concentration
mol H2SO4
0.025 L H2SO4
= 0.13 M H2SO4