Rank the following in order of increasing acidity: H2O, NH3, CH4, H2S, HCl CH4, NH3, H2O, ...

Rank the following in order of increasing acidity:

H₂O, NH₃, CH₄, H₂S, HCl

		CH₄, NH₃, H₂O, H₂S, HCl
		H₂O, NH₃, CH₄, H₂S, HCl
		NH₃, CH₄, H₂S, H₂O, HCl
		NH₃, H₂O, CH₄, H₂S, HCl

Expert Solution

The increasing order of acidity will be

NH₃< H₂O<CH₄<H₂S<HCl

Explanation :- H₂S is stronger. The explanation is the size of sulfur compared with the oxygen. Sulfur is bigger, so the overlap between hydrogen orbit and sulfur orbit is less efficient. For this reason, the H-S bond is weaker than H-O bond.

HCl is a stronger acid than H2S because Cl is more electronegative than S.

The electronegativity increases along the period . Acidity of hydrides of corresponding elements increases with increase in electronegativity.

We can also matches with pka value of the respective molecules. More the pka , lesser the acidity.

queen_honey_blossom answered 2 years ago

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