The rainwater sample

The five sentences below have been put in the wrong order.

1. The label prevented her confusing it with samples collected later.
2. Nia held an empty jar beneath the dripping gutter.
3. Back indoors, she wrote the date and location on a label.
4. Once the jar was half full, she screwed on the lid.
5. Rainwater began to collect inside it.

Identify which sentence should come second and which should come third in the coherent account. Write both sentence numbers, labelled second and third.