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This question is the same one in conq chem, literally been doing it for all of today and yesterday. In order to measure the concentration of mercury in sea water near an industrial plant, a team of chemsits used AAS. They first calibrated their instrument by admitting some standard solutions...

I got a coupla questions Is NaHSO4 an acidic or basic salt. Isn't bicarbonate ion amphiprotic? a and also is CaCl2 acidic, basic or neutral. By Bronsted Lowry theory of acid and bases, Ca is from weak base(CaOH) and Cl is from strong acid HCl so wouldn't it make a weak acid. Wikipedia says...

I dropped down from 4 U to 3U and I think that all the people in my class are really dumb. Has anyone ever done really well with just 3U and will these dumb people effect my learning?