to acidify the bleach solution. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Calcium hypochlorite: http://en.wikipedia.org/wiki/Calcium_hypochlorite Calcium hypochlorite From Wikipedia, the free encyclopedia Jump to: navigation , search Calcium hypochlorite Image:Calcium hypochlorite.jpg Systematic name Calcium hypochlorite Other names HTH Molecular formula Ca(ClO)2 Molar mass 143.1 g/mol Density x.xxx g/cm3 Solubility ( water ) x.xx g/l Melting point xx.x °C