A student is testing a substance using blue litmus paper, an indicator. She submerges the litmus paper in the substance she is testing and observes a
color change. Which of these is an accurate analysis of her observation?
The substance must be acidic because the litmus paper turned red.
The substance must be basic because the litmus paper turned red.
The substance releases OH-ions because the litmus paper turned green.
The substance has a pH 7.0 or greater because the litmus paper turned green