Need help physical chemistry
 

Given a pure 0.50 M of HCN solution, calculate the volume that when diluted to a total volume of 70.0mL will yield a pH that is 0.65 unit higher than that of the given solution. Consider the volumes of the original solution and of the diluent to be precisely additive.

I need help with the above question.

I think you ought to show some extent of your work to get the answer :wink:

Can someone please help me with bismuth. i need help on finding how the element got named and who discovered it?

Oh, it's very easy, simply go to wikipedia and search for that element, you'll be able to find almost everything you need in there, here is a link to wikipedia

Hope that helps :D