A 1.0-L buffer solution contains 0.100 mol HC2H3O2 and 0.100 mol NaC2H3O2 . The value of Ka for HC2H3O2 is 1.8 * 10-5 .Calculate the pH of the solution, upon addition of 0.080 mol of NaOH to the original buffer

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since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.