Question

The same study reported that the following reaction also tends to go forward:

AsH₂–+ H₂S ––––> AsH₃+ HS–

Which is the stronger acid, H2S or AsH3? Is this in agreement with the general trends for binary acids? This is an interesting example in that both the trends across the periodic table and down the periodic table are involved. Which has a greater influence, the trend across the table or the trend down the table? Does this fit with what you know about the relative acidities ofbinary acids of the second row (CH4, NH3, OH2, etc) and the halogen group(HF, HCl, HBr, etc.)?

Answer 1

Answer:

• The investigation reports that the response moves the forward way. H2S and AsH3 are the two acids. Usually learning that a corrosive base response continues toward the frail corrosive, i.e, a solid corrosive responds with a base to frame a feeble corrosive unexpectedly or effectively.

• Since, the response goes the forward way; H2S is a more grounded corrosive when contrasted with AsH3.

• The causticity of a twofold corrosive relies upon the electronegativity of the heteroatom (particle other than H in the parallel corrosive). The more effectively is the H lost from the paired corrosive, the more acidic is the compound.

• Since H2S is a more grounded corrosive, H2S loses H+ effectively to frame HS-. This effortless loss of H+ can be clarified as far as the electronegativity of S and As molecules. S is more electronegative than As iota(atom);

• Thus, S molecule in HS-is better ready to suit the negative charge, in this manner yielding the more balanced out base, HS-. As is less electronegative and consequently, less ready to suit the negative charge in AsH2-.

• The pattern is in accordance with the paired acids CH4, NH3 and H2O. Gracious is the more grounded base and henceforth, the proton is effectively lost from H2O. CH4 scarcely loses a proton to shape CH3-. A similar pattern of electronegativity of the focal iota functions admirably in the halogen acids HF, HCl, HBr, and so forth.

• HCl is the most grounded corrosive because of the solid electronegativity of Cl-(check the note beneath). HF is the weakest corrosive in the gathering (this is a special case).

• HF is required to be the most grounded corrosive because of the most noteworthy electronegativity of F atm. Be that as it may, note that F is the littlest molecule and an expanded electron thickness in F-prompts electron-electron aversion, in this way, making F-a feeble base and thus, HF is a weak acid.