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How can you tell

Posted: Sun Dec 01, 2019 10:38 am
by Adam Kramer 1A
How can you tell that the polyprotic acid or base is polyprotic by looking at the formula?

Re: How can you tell

Posted: Sun Dec 01, 2019 10:51 am
by William Chan 1D
If there's more than one H in front of the anion, let's say,

H2SO4, or H3PO4

It'll be polyprotic because there is more than 1 hydrogen in front.

Re: How can you tell

Posted: Sun Dec 01, 2019 11:05 am
by Juliet Stephenson 4E
Each H present in the anion will go on to form one hydronium ion. In HCl, one H begets one hydronium ion per molecule HCl (monoprotic). In H2S04, two H's will beget two hydronium ions per molecule H2So4 (biprotic/polyprotic). This is important to remember in calculating the pH of a substance.

Re: How can you tell

Posted: Sun Dec 01, 2019 3:06 pm
by Shutong Hou_1F
William Chan 1F wrote:If there's more than one H in front of the anion, let's say,

H2SO4, or H3PO4

It'll be polyprotic because there is more than 1 hydrogen in front.


Exactly! We should count the number of H atoms in the front of the anion, rather than count all H atoms, because not all H atoms would play a role in donating H atoms when dissociating in water. For example, CH3COOH is monoprotic, because only the last H atom would be donated, contributing to the fact that CH3COOH is an acid.

Re: How can you tell

Posted: Tue Dec 03, 2019 7:50 pm
by Shail Avasthi 2C
If an acid has more than one hydrogen which it can dissociate, it is polyprotic.

Re: How can you tell

Posted: Tue Dec 03, 2019 8:56 pm
by Leila_4G
Therefore, can only acids be polyprotic?
Because if a base is polyprotic doesn't that mean we are referring to its acidic properties of being able to give off protons so its an acid?

Re: How can you tell

Posted: Tue Dec 03, 2019 9:22 pm
by Alexa Hernandez 3k
A strong acid with several hidrogens

Re: How can you tell

Posted: Tue Dec 03, 2019 10:55 pm
by sarahsalama2E
Are polyprotic acids stronger or weaker with the more hydrogens that they have? I thought that if something has multiple hydrogens it is more likely to give off a proton, therefore dissociates more, and is therefore stronger of an acid.

Re: How can you tell

Posted: Tue Dec 03, 2019 11:07 pm
by 005321227
make sure that the anion has more than one hydrogen!

Re: How can you tell

Posted: Sat Dec 07, 2019 8:49 pm
by AmyL_3L
Since polyprotic acids and bases donate or accept more than one proton, respectively, there must be more than one hydrogen in the anion.

Re: How can you tell

Posted: Sat Dec 07, 2019 9:46 pm
by 105289321
If an atom can donate more than one H+

Re: How can you tell

Posted: Sat Dec 07, 2019 10:13 pm
by rohun2H
Typically, there will be more than one hydrogen.