Formation of Acetals from Aldehydes

In organic chemistry, carbonyl compounds are characterized by the presence of a carbon-oxygen double bond (C=O). They play a crucial role in various biochemical and synthetic processes. One common reaction involving carbonyls is the formation of hemiacetals and acetals, typically in the presence of alcohols. In this context, consider the following reaction: when propanal (a simple aldehyde) reacts with ethanol (an alcohol) in the presence of acid, what product is primarily formed?