Name alct haaioconstant of 1.00 x 10. Evaluate the calculation by cale assumptio

Question

Name alct haaioconstant of 1.00 x 10. Evaluate the calculation by cale assumption that the change in o acid can be ignored in an ng the hydronium ion concentration [Ho. at assumption for initial concentrations of the weak entration equilibrium the chage in concentration ofthewencentratioacid equilibrium with and without the HA] listed below. For the percent error calculation use the on) as the e value obtained without the assumption (from the XIns) %, error IHA HA/Ka assumption 1.0 M 0.10M 10x 102 M 1.0x 105 M1 1.0x 104 M 1.0 x 10 M 1.0 x 106M - 1,000 lo o lO 0 fter filling out the table, identify a reasonable value for the ratio of acid concentrationo equilibrium constant for the assumption to be valid.

Explanation / Answer

ans)

HA Ratio of HA/ Ka H3O+ without assumption H3O+ with assumption % age error 1 100000 0.0031 0.0031 0 0.1 10000 0.00099 0.001 -1.0101 0.01 1000 0.00031 0.00031 0 0.001 100 0.000099 0.0001 -1.0101 0.0001 10 0.000031 0.000031 0 0.00001 1 0.0000099 0.00001 -1.0101 0.000001 0.1 0.0000031 0.0000032 -3.22581 HA + H2O = A- + H3O+ HA A- H3O+ I 1 0 0 C - x +X +X E 1-x x x 0.00001 = x2/ 1-x 0.00001 -0.00001x -x2 =0 x2 + 0.00001x-0.00001 =0 If we ignore 0.00001 = x2/ 1-x 0.00001 = X2

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