Please select the buffer you wish to make up. Next, type in the volume and concentraion of the buffer needed, or to use any molecular weight leave the buffer selection on " Manual input " and type in a custom MW.
You want to make 0 ml of a 0 millimolar buffer.
Add 0 g of your g/mol compound to 0 ml of your solvent.
pH the solution as desired and fill to 0 ml final volume.