Polyprotic losing hydrogen

[Russell Chuang 1J]

Why is it harder for a polyprotic acid to lose its second hydrogen?

[amar_151]

It is harder for a polyprotic acid to lose its second hydrogen atom because after removing the first H+ proton, the resulting ion has a negative charge. It takes greater energy to remove another positively charged proton from an ion that is already negative.

[Alex FreeWolf 2E]

After removing H+ the ion that is created has a negative charge. It takes more energy to remove another H+ on a negative ion because the H+ has more electrons (negative charges) to be attracted to.

[Bobak Pourrahimi 2L]

At first, it is easy to remove an H+ from a polyprotic acid, since it is neutral. However, it becomes increasingly difficult to remove more and more H+ ions from a polyprotic acid because it gains a more negative charge everytime an H+ is removed, and it is very difficult to remove H+ ions from negative ions.

[Mya_Chiarappa_2C]

Once the first H+ is removed, the molecule is left with an overall negative charge. This means that removing a second H+ would bring the charge farther from neutral, which is more difficult.