I'm watching some (really awesome) chemistry courses, and I think I have a fairly decent handle on acids and bases (or maybe not, and I'm fooling myself). But the teacher just showed a table of weak/strong acids. HSOX4X− was one of them.
I'm wondering, why hydrogen sulfate ion instead of just hydrogen sulfate? Why is HSOX4X− an acid and HSOX4 apparently isn't? This was the only ion on the table. Or does HSOX4 simply not exist?