The (approximate) van't Hoff factor

The van’t Hoff factorSummarizing the examples:i for NaCl = 2HNaCl2ONa + + Cl i for HCl = 2HCl + H 2 O H 3 O + + Cli for NaOH = 2HNaOH 2ONa + + OH i for Ca(OH) 2 = 3HCa(OH) 2O2 Ca 2+ + 2OHi for H 2 SO 4 = 2 H 2 SO 4 +H 2 O HSO 4 +H 3 O +i for FeCl 3 = 4HFeCl 2 O3 Fe 3+ + 3Cl i for Na 2 S = 3HNa 2 S2O2Na + + S 2CH 3 OH (methanol an organic) i = 1CH 3 COOH (a weak acid) i = 1CH 3 OCH 3 (dimethyl ether an organic) i = 1NH 3 (a weak base) i = 1These factors are approximate and the true values, due toother subtle effects, are slightly different. We will ignorethese subtleties in General Chemistry.