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Which formula represents a hydronium ion?
A) H3O+
C) OH-
B) NH4+
D) HCO3
NaOH(s) dissolves in water

Sagot :

Sure! To determine which formula represents a hydronium ion, let's analyze each option provided:

A) H3O+
B) NH4+
C) OH-
D) HCO3

1. H3O+ (Option A)
- The hydronium ion is formed when an acid dissolves in water and donates a proton (H+) to a water molecule (H2O). This creates the H3O+ ion, which is a hydronium ion. This option is the correct representation of a hydronium ion.

2. NH4+ (Option B)
- This is the ammonium ion. It is formed when ammonia (NH3) accepts a proton (H+). While it has a positive charge, it is not the hydronium ion.

3. OH- (Option C)
- This is the hydroxide ion. It is produced when a base dissolves in water, releasing OH- ions. It is not the hydronium ion but rather a common component of basic solutions.

4. HCO3 (Option D)
- This is the bicarbonate ion. It is commonly found in bicarbonates like sodium bicarbonate (baking soda). It is neither a hydronium ion nor relevant in the context of acidic solutions where H3O+ would be present.

Therefore, the formula that represents the hydronium ion is:
A) H3O+