moles F- = 0.100 M x 0.0250 L=0.00250 moles H+ added = 5.00 x 10^-3 L x 0.0100 M= 0.000050 F- + H+ = HF moles F- = 0.00250 - 0.000050 =0.00245 total volume = 0.0300 L [F-]= 0.00245/ 0.0300=0.0817 M Solution moles F- = 0.100 M x 0.0250 L=0.00250 moles H+ added = 5.00 x 10^-3 L x 0.0100 M= 0.000050 F- + H+ = HF moles F- = 0.00250 - 0.000050 =0.00245 total volume = 0.0300 L [F-]= 0.00245/ 0.0300=0.0817 M.