# Why does Brady's reagent include sulfuric acid and methanol?

I'm supposed to explain why sulfuric acid and methanol are used in combination with 2,4-dinitrophenylhydrazine to form Brady's reagent. Are they just used as a solvent system for the hydrazine? Also, wouldn't sulfuric acid react with methanol?

2,4-DNPH is usually dissolved in an alcoholic solvent, together with sulfuric acid, when used as a reagent to detect aldehydes and ketones (Brady's reagent). The sulfuric acid is a source of $$\ce{H+}$$, which catalyses the reaction between the hydrazine group and the carbonyl compound, as depicted in the mechanism below: