Recent content by marcelo

I think if I have 10-5 of pH value we need 10-9 of pOH value to make Kw=-14 the reaction of water with CaCo3 is 2 per 1 (H+) + (OH-) + CO3(2-) + Ca(2+)----> HCO3(-) + Ca2(+) OH(-) (H+) + (OH-) +HCO3(-) + (Ca(2+) + OH(-)-----> H2CO3 + Ca(OH)2 since I need only 10^-2 concentration of OH- and we...

Considering a fish breeder decided to breed small fishes which needs a pH between 6,0 to 7,0 to stay alive. He needs to adjust the water's pH that is 5,0 to a value of 6.5, having available only calcium carbonate. The mass in mg added to 5L of water is about: A)2,5 B)5,5 C)6,5 D)7,5 E)9,5