A buffer solution contains 0.100 mole of sodium fluoride and 0.130 mole of hydrogen fluoride in one liter of solution. Calculate: (a) the concentration of the fluoride ion after the addition of 0.02500 mole of HCl to this solution.
(b) the pH after the addition of 0.02500 mole of HCl to this solution.

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

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