Carbonate Confirmatory Test Simulator

Carbonate Test (Lime Water)

Confirmatory Test for Carbonate (CO₃²⁻) Ions using Calcium Hydroxide.

1. Setup Experiment

Select Unknown Salt

Sodium Carbonate (CO₃²⁻) Sodium Chloride (Cl⁻) [Control]

0

1

2

2. Observation

Lime Water State Clear Aqueous

Status: Standby.
Select a solid salt. Dilute HCl will be added to the reaction tube. Any evolved gas will be passed through a delivery tube into clear Lime Water (Ca(OH)₂).

3. Chemical Principles

Stage 1 (Milky): CO₂ reacts with Lime Water to form a white, insoluble precipitate of Calcium Carbonate.

Ca(OH)₂ + CO₂ → CaCO₃↓ (White) + H₂O

Stage 2 (Clear): Passing excess CO₂ converts the insoluble precipitate into soluble Calcium Bicarbonate, turning the solution clear again.

CaCO₃ + H₂O + CO₂ → Ca(HCO₃)₂ (Soluble)

Visual Key

Clear Lime Water

Milky CaCO₃ Precipitate

CO₂ Bubbles

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