Jump to ege -CHE 168-Spring18-MCGREGOR Activities and Due Dates Topic 5 Skills P
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Jump to ege -CHE 168-Spring18-MCGREGOR Activities and Due Dates Topic 5 Skills Practice Video C Gradebook 2/24/2018 11:55 PM 00/32/20/2018 11:43 AM PrintCalulator Periodic Table estion 2 of3 Map For the diprotic weak acid H2A, Ka.-2.1x106 and Kg=82×100. What is the pH of a 0.0550 M solution of H2A? What are the equilibrium concentrations of H2A and A? in this solution? STRATEGY: Make a table of molar concentrations for each successive dissociation step. -H+ (aq)+HA"(ag) H,A(aq) nitial: 0.0550 Kal-0.0550-x=0.0550 0.0550- 0.0550 a- K, x 0.0550 x-12.1x 10-6)(0.0550) = 0.00034 M Change: -x +x +x HA-lag) H+(aq)+A2-(aq) Initial: x Change: -y +y ty Finally, give the numerical value of y Express Ks2 in terms of x and y, then show the simplified expression (when y is assumed to be negligible compared to x) Number complete (no simplifications) simplified O Previous Give Up & Views ution D check Answer Hint Next ExitExplanation / Answer
from equation 2,
Ka2 = (x+y)y/(x-y)
when y is negligible as compared to x then
Ka2 = xy/x = y = 8.2 x 10-9 M
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