Interactive practical · Experiment 01
Acids, Bases & Indicators
Investigate acidic and basic solutions, test indicators, measure pH, perform a virtual neutralisation and identify an unknown sample through experimental evidence.
EXPERIMENT WORKBENCH
MODE · INDICATOR TESTING01 / Indicator reaction stationDrag a reagent to a test tube or select it from the cabinet
TEST TUBE A
Drop reagent here
TEST TUBE B
Drop reagent here
INDICATOR BEAKER
Drop reagent here
Select a solution, then choose an indicator below to observe its characteristic colour.
Choose an indicator
Sample pH1.0Model value
NatureAcidicStrong acid
Indicator—Last test
02 / Digital pH analyserProbe measurement · idealised solution model
SAMPLE BEAKER
⌁
pH PROBE
LIVE READING1.0pH units
ACIDICNEUTRALBASIC
024678101214
Interpretation
A pH below 7 indicates an acidic solution. The smaller the pH, the more acidic the solution in this model.
03 / Neutralisation stationAcid + base → salt + water
ACID · 20 mL
HCl model
+
BASE · 20 mL
NaOH model
→
REACTION MIXTURE
Reaction analysis
Adjust volumes and concentration, then mix to compare acid and base amounts.
HCl + NaOH → NaCl + H₂O
04 / Unknown substance investigationUse evidence, not guessing
UNKNOWN X
Case file
A sample has been submitted for identification. Test it with available indicators and the pH analyser. Select its likely nature and justify your conclusion.
Evidence log
No tests performed yet.
Laboratory observation notebook
Each recorded test is added to your notebook. Export observations as CSV or generate a practical report for revision and teacher review.
| # | Sample | Test | Observation | pH |
|---|---|---|---|---|
| No observations recorded yet. | ||||
KNOWLEDGE CHECK · APPLY YOUR UNDERSTANDING
3 QUESTIONSQ1. Which pH indicates a neutral solution at 25 °C?
Q2. What happens to blue litmus in an acidic solution?
Q3. Neutralisation of an acid by a base produces generally…