The acidity of the oxoacids was described on page 789, and a larger number of ac

Question

The acidity of the oxoacids was described on page 789, and a larger number of acids are listed in the table below. The data for Question 114 is given on the left. Use this data to answer Questions 114b and 114d, which are given below. What has a greater effect on acidity, the number of O atoms bonded directly to the central atom E or the number of OH groups? The acid H3PO3 has a pKa of 1.8, and this led to some insight into its structure. If the structure of the acid were P (OH)3, what would be its predicted pKa value? Given that this is a diprotic acid, which 11 atoms are lost as H + ions? In answering Question 114d, note that the correct molecular structure of H3PO3 is given in the question. The acid H3PO3.

Explanation / Answer

(b)acidity is the ease with which a proton can be ejected. Therefore , number of OH groups has greater effect on acidity as the proton is ejected from the OH groups only

(d)If the structure would have been P(OH)3 , then the pKa value would have been less than 1.8.

The H -atoms which are directly bonded to the O- atoms are lost as H+ ions

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