Indicator Hunt: Mystery Solutions Challenge
Aim: Two unlabelled beakers (Solution A and Solution B) have arrived from the chemical pantry. One contains Dilute Hydrochloric Acid (HCl) and the other contains Dilute Sodium Hydroxide Solution (NaOH). Using the 10 NCERT indicators provided in the cabinet, identify which solution is which by testing and recording your observations.
🔴 Solution A
Unknown — test to identify
🟢 Solution B
Unknown — test to identify
🎯 Your Mission
Test both with ≥ 2 indicators, then deduce which is acid & which is base
Mystery Solutions — Test with NCERT Indicators
1. Select an Indicator:
2. Click a Test Tube to Test:
Solution A
Not tested yet
Solution B
Not tested yet
← Select an indicator from the cabinet, then click a test tube to apply it.
Observation Table & Deduction Zone
Recorded Observations
| # | Indicator Used | Tube | Observed Reaction | Preliminary Inference |
|---|---|---|---|---|
| No observations yet. Apply indicators from the workbench above. | ||||
Concept Verification & Viva Questions
1. Phenolphthalein turns pink in which type of solution?
2. Which of the following is an olfactory indicator?
3. If Methyl Orange turns yellow in Solution X, what can you conclude?
4. What colour does turmeric paper turn when dipped into a basic solution like NaOH?
5. Why should you test at least 2 different indicators before concluding which solution is an acid or base?