Sage-Tips

Why does acidic strength decrease down the group?

The acidic strength increases down the group because the bond strength decreases down the group.

Why is HCl stronger than HI HBr?

The same reasoning applies for both HBr and HI. These acids are even stronger than HCl because the Br– and I– ions are even larger. As such, the H-Br and H-I bonds are even weaker, and these compounds also readily dissociate in solution.

Why HF AQ is a weak acid while HCl aq HBr AQ and HI AQ are all strong acids?

Fluorine is highly electronegative, so the bond in HF is a polar covalent bond. The more polar a bond is, the easier it is to remove the proton or hydrogen from the acid. So, hydrochloric acid (HCl) is a stronger acid than hydrobromic acid (HBr). Based only on its polarity, one might expect HF to be stronger than HCl.

Which is more acidic HCl or PH3?

HCl is a stronger acid than HI because Cl is more electronegative than I. PH3 is a stronger acid than H2S because P is larger than S. HPO42- is a stronger acid than H2PO4- because it has more charge (is more unstable). HClO4 is a stronger acid than HClO3 because it has more oxygens around its central atom.

Why does acid strength increase down group 17?

The acid strengths of the oxoacids of the halogens increase with increasing oxidation state, whereas their stability and acid strength decrease down the group.

Does acid strength increase down a column?

Acidity INCREASES as you go from left to right across the periodic table and DECREASES as you go down a group/column. The opposite is true for Basicity: INCREASES as you go up a group/column and DECREASES as you go from right to left across the periodic table.

Why HI is more acidic than HBr?

The strength of acidic character in halogen acids increases form HF to HI down the group, due to decrease in bond energy down the group (↓).

Why acidic strength decreases in the order HCl h2s PH3?

The acidic strength decreases because of decrease in polarity of E—H bond from H—Cl to P—H which is due to decrease in electonegativity of E. (ii) This is due to inert pair effect. The stability of +5 oxidation state decreases down the group in group 15.

What is the acid strength of hfhf HCl HBr HI?

HF, HCl, HBr, HI – increasing acid strength. The bond dissociation energy of H-X molecules where X = F, Cl, Br, I, decreases with an increase in the atomic size. Since H-I bond is the weakest, HI is the strongest acid. Acid strength of HF, HCI, HBr and HI depends upon their bond dissociation enthalpies.

Why is HClO a stronger acid than HBrO?

In direct contrast with HCl vs. HBr, HClO is a stronger acid than HBrO, because Cl is more electronegative, which dominates over the size difference between Cl and Br due to the presence of the oxygen.

Why does the acidic strength increase down the group?

Down the group the electronegativity decreases and the size increases. Thus, it becomes easy to lose H + ion. This causes the increase in acidic strength down the group. Was this answer helpful?

Why is Hihi a stronger acid than HBR?

HI is a stronger acid than HBr; the primary reason is that I is larger than Br, and makes a weaker bond with H (there is a counteracting electronegativity trend, which is not significant here). Weaker bond = stronger acidity.