OXYGEN IS MORE ELECTRO NEGATIVE THAN SULPHUR...
YET H2S IS MORE ACIDIC THAN H2O...BECAUSE..
1. H-S bond is weaker than H-O bond..
2.H2O is a highly associated liquid.
2007-03-02 02:48:10 · 4 answers · asked by physics 2 in Science & Mathematics ➔ Chemistry
Actually it is because S is bigger than O and thus in the anion HS- the charge is much better stabilized than in OH-.
It is the same principle as why the acidity series of hydrogen halides is HI > HBr > HCl > HF though the electronegativity series is the opposite.
Since we have to choose between the two, #1 (bond strength) is the more accurate.
2007-03-02 02:58:07 · answer #1 · answered by bellerophon 6 · 0⤊ 0⤋
Acidity is the ability to generate H+ (in water). Water reacts with its self to create H+ and OH- (the concentration of H+ in pure water is the reason why its at pH 7).
1.S is a larger atom than O (as the person before said) and that is why the bond is weaker. Hydrogen is very small.
2. H2O is a highly associated liquid due to a Van Der Waals force called hydrogen bonds. Its what makes water 'sticky'. Also H2S is a gas at room temperature (not a very nice one!) but water is not. Hydrogen bonds are a very important part of chemistry (and biology!). The theory is used at all levels of chemistry.
Hope this helps, if you need any more help try Wikipedia.
2007-03-02 12:39:35 · answer #2 · answered by wightchemist 1 · 0⤊ 0⤋
H2O is neutral as it consists of weak bond which can be broken easily.H2S consists of covlent bond which is a stronger bond .
2007-03-02 14:03:14 · answer #3 · answered by scorpion 2 · 0⤊ 0⤋
HOH has hydroxyl groups which raise pH. They don't exist in HSH. Also, HOH has hydrogen bonding which is not found in HSH.
2007-03-02 10:55:47 · answer #4 · answered by Matthew P 4 · 0⤊ 1⤋