Rancid butter is acidic. The breakdown of fats in butter that causes it to go rancid can produce free fatty acids, which have acidic properties.
The acid found in rancid butter is typically butyric acid. It gives off a strong, rancid smell and sour taste when butter goes bad.
Go buy fresh butter
you can do it by boiling it
Rancid.
Rancid butter is not an acid or an alkali. It is the result of fats in butter breaking down due to exposure to oxygen, light, or heat, creating unpleasant flavors and odors.
The common name of the carboxylic acid found in rancid butter is butyric acid.
Do you mean 'synthetic' butter? And by rancid do you mean it doesn't taste as good as cow's butter? If so, simply because synthetic butter is generally a mixture of oils, water and flavorings. Butter is made from cream which comes from cows.
"Turned" in the given sentence is a verb in its past tense. In this instance, "turned" is being used as a synonym for "became", and "rancid" is an "objective complement" of the "predicate adjective" type.
Rancid butter contains butyric acid, which is responsible for the foul smell and taste associated with spoiled dairy products. Lactic acid and acetic acid may also be present in rancid butter as byproducts of bacterial fermentation.
Having a rank smell or taste, from chemical change or decomposition; musty; as, rancid oil or butter.
Having a rank smell or taste, from chemical change or decomposition; musty; as, rancid oil or butter.