News from Mathnasium of Northside San Antonio. Pricing Change. I hope your students have had a great start to the school year. As the 1st six week grading period wraps up, you may be considering enrollment options at Mathnasium.
Lime water is a solution of calcium hydroxide (slaked lime). When carbon dioxide is bubbled through it, a solid precipitate of calcium carbonate is formed. Calcium carbonate is chalk or limestone, and it is this that makes the lime water cloudy. calcium hydroxide + carbon dioxide calcium carbonate + water.hen carbon dioxide is bubbled through it, a solid precipitate of calcium carbonate is formed. Calcium carbonate is chalk or limestone, and it is this that makes the lime water cloudy. calcium hydroxide + carbon dioxide calcium carbonate + water.
The reaction is shown below: Calcium carbonate is basically chalk and is poorly soluble in water. So it will precipitate from the solution and turn it milky white. So if an unknown gas is bubbled through limewater and the result is a milky white solution, you have a positive test for carbon dioxide.