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Solution A has equal parts mixed of 1 M HF and 1 M NaCl. Solution B...

Solution A has equal parts mixed of 1 M HF and 1 M NaCl. Solution B has equal parts of 1 M HCl and 1 M HF. Show your work, please use Ka = 6.8 x10-4 for HF . I'm not sure if I should use the Henderson-Hassalbalch Equation or the ICE table method. Also because the Ka is only 6.8 x10-4  I don't believe its possible to negate the the -x. Our professor told us it must be at least to the x10-5.

a) Determine the resulting pH of both solutions.

b) Finally, write an equation explaining the relationship of the two pH's.

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