Posted: Wed Dec 05, 2018 9:23 pm
For 6C.17, it gives two acids and you have to decide which is stronger. For c-f, how can you tell which is stronger? (The problems are c. HBrO2 vs HClO2, d. HClO4 vs H3PO4, e. HNO3 vs HNO2, f. H2CO3 vs H2GeO3)
Re: Problem 6C.17
Posted: Thu Dec 06, 2018 1:42 pm
There are two rules to decide the relative strength of two acids:
1. strong acids can lose proton(s) easily: if a acid has a long and weak A-H bond, then it can lose the proton more easily, and therefore making it a stronger acid.
2. strong acids has anions that are stable: 1) typically, if the anion of an acid has resonance structure, then the acid is strong because the actual structure of the anion is a blend of all its electrons, therefore, the negative charge is delocalized and the resulting anion is stable(hard to accept protons); 2) if the anion contains an atom that can delocalize the negative charge( for example, an atom with high eletronegativity that pulls the electron towards it), the anion will be stable and thus stronger the acid.