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this is 2 part question for my physics 1.a person is to be fitted with bifocals. she can see clearly when the object is between 46cm and 2.4m from the eye. the upper portion of the biofocals should be designed to enable her to see distant objects clearly. what power should they have? answer in...

use Ka= 1.8 X 10-5? what is the PH of a solution that contains 0.15M hc2h3o4 and 0.25 M c2h3o2? use Ka= 1.8 X 10-5.....................i know how to do this part.... Ph is 3.3 i need to do second part: by how much will the Ph change if 0.025 mol of HCL is added to 1.00 L of the buffer in...