Quella
Quella is the feminine singular demonstrative determiner and pronoun in Italian, meaning that or that one when referring to a feminine noun or to a feminine subject previously mentioned. As a determiner it accompanies feminine singular nouns, as in quella casa or quella ragazza, and it agrees in gender and number with the noun it modifies. As a pronoun it can stand in for a feminine noun: quella è la mia, that one is mine.
Before nouns starting with a vowel, the form often contracts to quell’ (with an apostrophe): quell’idea, quell’acqua.
Quella belongs to a family of Italian demonstratives that vary by gender, number, and phonological context.
Usage notes: quale or quale? Not applicable here; quale is a separate interrogative. Quella is common in