lab question acidic

[Willow18]

For the organi acids below, circle the hydrogen or hydrogen that are acidic.

Oxalic acid...HOOC-COOH   don't know which hydrogens here are acidic.

Formic Acid   HCOOH

Acetic acid   Ch3COOH

[kingchemist]

When benzene carboxylic acid (benzoic acid ) ionises it does so as follows:
C6H5COOH <===> C6H5COO- + H+

[Chemsupport]

For the organi acids below, circle the hydrogen or hydrogen that are acidic.

Oxalic acid...HOOC-COOH   don't know which hydrogens here are acidic.

Formic Acid   HCOOH

Acetic acid   Ch3COOH

Acidic Hydrogens are those which can be easitly removed as H+ ion
In Oxalic acid H--OOC-COO---H
In Formic acid HCOO----H
In Acetic Acid CH3COO---H
Those shown in orange color are acidic hydrogens

[shengoc]

For the organi acids below, circle the hydrogen or hydrogen that are acidic.

Oxalic acid...HOOC-COOH   don't know which hydrogens here are acidic.

Formic Acid   HCOOH

Acetic acid   Ch3COOH

For oxalic acid which is a dicarboxylic acid, both the H at the COO end are acidic.
Formic acid(methanoic acid) and acetic acid are mono-carboxylic acid, so only the H connected to the COO end is acidic.

One thing to note is that, when you say acidic, any H can be acidic, it just depends on how stable the conjugate base formed after H+ dissociation. ie for all carboxylic acid, the conjugate base can be stabilised by resonance/conjugation via the pi framework of the carboxylate conjugate base formed.