Acid chloride compounds (acyl chloride) such as ethanoyl chloride, benzoyl chloride hydrolysis easily in the water and give carboxylic acid and HCl as the products. We know carboxylic acid is a weak acid and HCl is a strong acid in the water.
Note that, acid chlorides are also named as acyl chlorides or carboxylic acid chlorides.
Aqueous acid chloride is a very acidic solution due to formation of a mixture of strong acid and a weak acid. This hydrolysis reaction is a elimination reaction and water is participated as a reagent. This reaction completely converts acid chloride to a carboxylic acid and HCl (Hydrochloric acid). Carboxylic acids are weak acids while HCl is a strong acid.
Ethanoyl chloride is an acid chloride compound with two carbon atoms. Ethanoic acid and HCl are given as products by the hydrolysis of ethanoyl chloride. Ethanoyl chloride is soluble in water and form a strong acidic solution due to formation of HCl acid. HCl is one of the strongest acid. pH value of the solution will be lower than seven and that pH value may depend mainly on the formed HCl concentration.
In this lesson, you learned that acyl chloride will give a strong acid and a weak acid as products. Then, aqueous solution is definitely an acidic solution and should show low pH values (below than 7). If 0.1 mol of acyl chloride hydrolysis in 1 dm3 of water, that solution should have a pH value below than 1 theoretically.
Acetyl chloride is another name used for ethanoyl chloride. So hydrolysis reaction is same as ethanoyl chloride. Acetyl chloride is an acyl chloride with two carbon atoms. It will hydrolysis in the water and give HCl acid and acetic acid (ethanoic acid) as products. Acetic acid is a carbonic compound while HCl is an inorganic acid.
Acyl chloride + water reaction will form an electrolyte solution due to formation of HCl acid. HCl acid dissociates completely in the water and give H+ ions and Cl- ions to the water.
Qualitative Analysis for anions and cationsEmission of gases Identify ammonium salts identify d block cations by ammonia solution Identify halides Identify carbonate ions identify chromium compounds Testing for thiosulfate (S2O32-) Testing for phosphate ion