Hemos vaciado la taza para medir la proporción correcta, así que ya está vacía.

Questions & Answers about Hemos vaciado la taza para medir la proporción correcta, así que ya está vacía.

Why does this sentence use vaciado in the first half but vacía in the second?
This highlights the lesson's focus on verbal versus adjectival forms. Vaciado is the regular past participle of vaciar (to empty). It is used with the helping verb haber to form the perfect tense (hemos vaciado means we have emptied). On the other hand, vacía is the adjectival form used with estar to describe the resulting physical state of the cup (está vacía means it is empty).
Why does vacía have an accent mark on the 'i', but vaciado does not?
The accent mark on vacía breaks the natural diphthong (the blending of the 'i' and 'a'), forcing the spoken stress onto the 'i'. In vaciado, the spoken stress naturally falls on the second-to-last syllable (the 'a' in the -ado ending), so the 'i' and 'a' blend together and no written accent mark is needed.
Could I use por medir instead of para medir here?
No, para is required here because it expresses a specific purpose or goal (in order to measure). If you used por, it would change the meaning to express a cause or reason (because of measuring), which does not make sense in this context.
As a quick refresher, why do we use estar in está vacía instead of ser?
We use estar because it describes the current condition or state of the cup, specifically as the direct result of an action (the emptying we just did). Ser is reserved for inherent, defining characteristics of an object.

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