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STEP 1:
Add calcium carbonate (marble chips) to hydrochloric acid
STEP 2:
Bubbles form (carbon dioxide released)
STEP 3:
Chips start dissolving
STEP 4:
Add more chips
STEP 5:
More bubbling occurs
STEP 6:
Reaction stops
STEP 7:
Extra chips remain (ensures all acid is used)
STEP 8:
Pour mixture through filter paper
STEP 9:
Pour filtrate into evaporating dish
STEP 10:
Heat gently → solution thickens
STEP 11:
Leave to cool
STEP 12:
Crystals form (evaporation)