?Iridium crystallizes in a face-centered cubic unit cell that has an edge length of \(3.833 \AA\). (a) Calculate the atomic radius of an irid

Step 1 of 5) The acid-dissociation constants for common polyprotic acids are listed in Table 16.3, and Appendix D provides a more complete list. The structure of citric acid illustrates the presence of multiple ionizable protons in Figure 16.13. Notice in Table 16.3 that in most cases the Ka values for successive losses of protons differ by a factor of at least 103. Notice also that the value of Ka1 for sulfuric acid is listed simply as “large.” Sulfuric acid is a strong acid with respect to the removal of the first proton. Thus, the reaction for the first ionization step lies completely to the right: For many polyprotic acids Ka1 is much larger than subsequent dissociation constants, in which case the H+1aq2 in the solution comes almost entirely from the first ionization reaction. As long as successive Ka values differ by a factor of 103 or more, it is usually possible to obtain a satisfactory estimate of the pH of polyprotic acid solutions by treating the acids as if they were monoprotic, considering only Ka1.