Breakdown of Ich gehe zur Bibliothek, um Deutsch zu lernen.
Questions & Answers about Ich gehe zur Bibliothek, um Deutsch zu lernen.
Zur is a contraction of zu der.
In spoken and written German, this contraction is very common and sounds more natural here. Both zu der Bibliothek and zur Bibliothek are grammatically correct, but zur is what people normally say.