Calculate the pH of a buffer consisting of 0.50 M HF and 0.45 M F- (Ka of HF = 6.8 x 10 -4). i) Before addition of NaOH.
ii) After addition of 0.40 g of NaOH to 1.0 L of the buffer.

a galvanic cell( aka voltaic cell) and electrolytic cell

explanation:

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b is the correct

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.