Acids, bases and salts · Grade 11
pH titration curve
ChemAI · Worksheet
NameClassDate
Aim
Add acid from a burette and draw the S-shaped curve.
Before you start: what do you predict will happen? Why?
What you do
| Step | What I observed | |
|---|---|---|
| 1 | Turn on the pH meter. Open the data logger, choose pH and tick “x = acid added”. | |
| 2 | Open the burette tap and let 15 mL of hydrochloric acid run in (×5 makes it faster). | |
| 3 | Near the end point turn the tap to drop by drop, up to 25 mL. | |
| 4 | Read the equivalence point from the steep part of the graph (about 20 mL). | |
| 5 | From the graph: at what volume of HCl is the equivalence point (mL)? |
Calculation
From the graph: at what volume of HCl is the equivalence point (mL)?
Questions
- Write a word or symbol equation for one reaction you observed.
- Explain your most important observation using particles, ions or energy.
- Was your prediction right? What would you change to get a more reliable result?