what does [HIn] and [In] stand for? what are the importance of them? are they the concentrations of H and OH? or pH and pOH? another Q: the compound Ag2S has solubility of 1.3 * 10^-4M at 25 degrees celsius. what is the ksp? i tried using the ICE table, but the answer i got was wrong. the correct answer is 8.8 * 10^-12 but i have no idea how to get that answer.. also, would u look at the Ka of an acid to find the highest pH value? the Q asks: the 1.0M acidic solution with highest pH value is... -H2S -HNO2 -HNO3 -H3BO3 << thats the correct answer, but i thought it would be HNO3 as it has a higher Ka value and is a stronger pH.. -how does pH relate to Ka, temperature and the strength of an acid?