Determining Acid Strength

[Taizha 1C]

How would i determine the differences in strengths of acids? or how would i rank the acids? Would i determine the strength based on which is most acidic and which is the most electronegative?

...or does anyone have any recommendations to do this?

[Chris Fults 1C]

The bond strength of an acid generally depends on the size of the 'A' atom: the smaller the 'A' atom, the stronger the H-A bond. HF has the strongest bond and is the weakest acid. The strong bond between the more similarly-sized HF atoms doesn't want to break and allow the H to transfer. In contrast, HI is a very strong acid as Iodine has a very large atomic radius while H has a very small one. Therefore, HI has a greater proton transferer making it a stronger acid.

[Alejandro Salazar 1D]

I would recommend memorizing the 7 common strong acids, which are HCI, HBr, HI, HNO3, HCIO3, HCIO4, H2SO4

[Taizha 1C]

I would recommend memorizing the 7 common strong acids, which are HCI, HBr, HI, HNO3, HCIO3, HCIO4, H2SO4

Are those acids already ranked from strongest to weakest? For example, HCl > HBr > HI ......?

[Chem_Mod]

You have to know how to determine it from given the formula (because 1. H is loosely held, 2. the conjugate base formed stabilizes the negative charge better). Or you can compare it using Ka or pKa values.

[Ashley Martinez 1G]

It might also be helpful to note acid strength can also help determine base characteristics. For example, the stronger the acid, the weaker its conjugate base. The weaker a conjugate acid, the stronger the base.

[Nimrat Brar 1E]

I would recommend memorizing the 7 common strong acids, which are HCI, HBr, HI, HNO3, HCIO3, HCIO4, H2SO4

Are those acids already ranked from strongest to weakest? For example, HCl > HBr > HI ......?

No, these strong acids go in the order of HI > HBr > HCl > HF. HI is the strongest acid.