The pH of Ca(OH)2 in a saturated mixture of water at 25 degrees Celsius is 12.4. This is comparable to ammonia, which has a pH of 11.6 in a saturated mixture of water.
"Calcium hydroxide" or "calcium hydrate" are the written form of Ca(OH)2. Calcium hydroxide is an odorless, white powder that has an alkaline taste. The combination of calcium oxide with water creates calcium hydroxide. Cement, cleaners, and solvents are products that contain calcium hydroxide. Ingestion of calcium hydroxide can cause severe pain, bloody vomiting and sudden weakness.
Lime water is water with dissolved calcium hydroxide. It has the ability to remove carbon dioxide from the air.