To determine which ion is found in a glass of water, let's analyze the given options:
A. [tex]\( O_2 \)[/tex]:
- [tex]\( O_2 \)[/tex] is the molecular form of oxygen gas. In its standard form, [tex]\( O_2 \)[/tex] is not an ion, but a neutral molecule. While oxygen gas can dissolve in water, it does not exist as an ion.
B. [tex]\( H^+ \)[/tex]:
- [tex]\( H^+ \)[/tex] represents the hydrogen ion, also commonly referred to as a proton. This ion is very common in aqueous solutions. In water, [tex]\( H_2O \)[/tex] can dissociate to form hydrogen ions [tex]\( H^+ \)[/tex] and hydroxide ions [tex]\( OH^- \)[/tex]. The presence of [tex]\( H^+ \)[/tex] ions is particularly notable in acidic solutions, where their concentration is higher. Therefore, [tex]\( H^+ \)[/tex] is indeed an ion found in water.
C. [tex]\( O^- \)[/tex]:
- [tex]\( O^- \)[/tex] represents an oxygen ion with a single negative charge. This ion is not commonly found in water. Oxygen typically exists in water in its neutral molecular form [tex]\( O_2 \)[/tex] or as part of other compounds like [tex]\( H_2O \)[/tex] or [tex]\( OH^- \)[/tex] (hydroxide ion). [tex]\( O^- \)[/tex] is not stable in water.
Based on this analysis, the correct choice is:
B. [tex]\( H^+ \)[/tex]
This solution is reflective of the ion commonly present in a glass of water.
