2011-03-27, 09:53 PM
The concentration would be 3M.
What I did was find out how many moles of HCl there are 3.0mL of 6M HCl, which is 0.018mol. You're adding 3.0mL of water to 3.0mL of 6M HCl, so you'll end up with 6.0mL. Plug in 0.018mol of HCl in 6.0mL of the solution, and you should get 3mol/L; 3M.
This method is pretty weird though, mainly because I can't remember the proper formulas at the moment...
What I did was find out how many moles of HCl there are 3.0mL of 6M HCl, which is 0.018mol. You're adding 3.0mL of water to 3.0mL of 6M HCl, so you'll end up with 6.0mL. Plug in 0.018mol of HCl in 6.0mL of the solution, and you should get 3mol/L; 3M.
This method is pretty weird though, mainly because I can't remember the proper formulas at the moment...