+- Forums (https://eu-forums.com)
+-- Forum: World Wide Talk (https://eu-forums.com/forum-12.html)
+--- Forum: Science and Technology Forum (https://eu-forums.com/forum-8.html)
+--- Thread: CHEMISTRy*!? (/thread-5492.html)
CHEMISTRy*!? - Lindorie - 01-25-2011
how much water should be added to 500.0ml of a solution of HCI with pH of 2.00 to bring the pH to 2.50?
Re: CHEMISTRy*!? - Millie - 01-25-2011
The concentration of the HCl solution is (log)^-1(2) = 0.01M
You want to make it pH 2.5 which has a concentration of (log)^-1(2.5) = 0.00316M
concentration = no of moles*volume
c = n/v
you are going to add x Litres of water to a solution that contains 0.5*.01 = 0.005 moles of HCl
so 0.00316 = .005/(0.5 + x)
0.5 + x = 0.005/0.00316 = 1.582L
x = 1.582 - 0.5 = 1.082L