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Chalk is calcium carbonate. Cola is an acid. When these two compounds mixed, hydrogen carbonate is formed. This compound is water soluble, and thus chalk mixed with and acid like cola dissolves in water.
When iodine solution is mixed with starch solution they produce blue-black color.
Any reaction; iodine is used to test the contamination with starch.
Limescale is mostly calcium carbonate with some magnesium carbonate mixed in there as well. So the answer would be calcium.
Petrol changes color when mixed with iodine solution due to covalent bonding.
carbon dioxide and water
Purple
Any reaction occur.
Carbon Dioxide
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Calcium carbonate is a base and hydrochloric acid is an acid but their combined pH depends on ther initial concentrations.
crimson red
this produces carbon dioxide
No. Iodine is an indicator of starch which results in a bluish-black color when mixed.
The gas released in the reaction of calcium carbonate with hydrochloric acid is carbon dioxide. CaCO3 + 2 HCl = CaCl2 + CO2 + H2O