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Calculate the pH for each of the following cases in the titration of 25.0 mL of

ID: 916320 • Letter: C

Question

Calculate the pH for each of the following cases in the titration of 25.0 mL of 0.210 M pyridine, C5H5N(aq) with 0.210 M HBr(aq). The Kb 1.7e-9.

d) after the addition of 25.0mL of HBr

Calculate the pH for each of the following cases in the titration of 25.0 mL of 0.210 M pyridine, CsHsN(aq) with 0.210 M HBr(a). The ionization constant for pyridine can be found here Number (a) before addition of any HBr 9.28 Number 5.24 Number 4.74 Numberconjugate acid of pyridine 2.96 (b) after addition of 12.5 mL of HBr After 25.0 mL of HBr has been added, the solution has reached the equivalence point and is no longer considered a buffer. The pH of this solution is controlled by the dissociation pyridinium ion, the (c) after addition of 19.0 mL of HBr To determine the pH, find the concentration of of CsHsNH and solve for the [H' using the appropriate Ka expression (d) after addition of 25.0 mL of HBr Number (e) after addition of 29.0 mL of HBr 6.10 C,H,NH

Explanation / Answer

Calculate the pH for each of the following cases in the titration of 25.0 mL of