How is limewater formed?
Lime water is a solution of sodium hydroxide. Lime water is formed by dissolving calcium oxide, CaO or quicklime in water.
limewater is Ca(OH)2 the reason for CO2 to turn limewater milky is because Ca(OH)2 (aq) + CO2 (g) → CaCO3 (s) + H2O (l) the precipitate CaCO3 formed. I think SO2 could also turn limewater milky because the product CaSO4 is only slightly soluble in water, so most of it remains as a precipitate. Ca(OH)2 + SO2 ---> CaSO4 + H2O
The carbonates in marble will react with the acid in vinegar in the reaction: acid + carbonate = water + salt + carbon dioxide. Thus, the volume of vinegar will decrease, the volume of the marble will also decrease, a salt will be produced, and effervescence occurs (bubbles are formed). To test the gas in the bubbles produced, pass it through aqueous calcium hydroxide (limewater). A white precipitate will be formed in the limewater shortly.
If a plant is put into limewater in a testube which is sealed and left overnight Will the limewater become very chalky?
Limewater is a saturated solution of calcium hydroxide. When CO2 gas is bubbled into limewater it forms calcium carbonate, which is insoluble, and turns the limewater cloudy. Oxygen or hydrogen are not very soluble in water, and they don't hydrolyze or form OH- ions that will shift the equilibrium. Therefore, O2 or H2 won't cause limewater to turn cloudy. 4 years ago