With the help of a chemical equation, suggest a role for the acid in the formation of 2,4-dinitrophenylhydrazones.

the acid is used in removing water, hence converting RCH-OH NHNH-CCHCHC(NO₂)C(NO₂)CH to RCH=NNH-CCHCHC(NO₂)C(NO₂)CH.

Explanation:

When hydrazine is reacted with a carbonyl group containing compound, RCH=O, it gives the product, RCH-OH NHNH-CCHCHC(NO₂)C(NO₂)CH as given in the chemical reaction shown in step one below:

STEP ONE:

H₂NH-CCHCHC(NO₂)C(NO₂)CH + RCH=O <> RCH-OH NHNH-CCHCHC(NO₂)C(NO₂)CH.

Kindly note that this reaction is a reversible reaction.

STEP TWO:

This step shows the the addition of the acid to RCH-OH NHNH-CCHCHC(NO₂)C(NO₂)CH, this addition of acid causes the removal of H₂O from this compound, hence forming 2,4-dinitrophenylhydrazones.

RCH-OH NHNH-CCHCHC(NO₂)C(NO₂)CH + HA > H₂O + HA + RCH=NNH-CCHCHC(NO₂)C(NO₂)CH.

can you list the answers so i can answer

if you're asking what comes out, it's steam.