An aqueous solution at 25∘C has a hydronium ion concentration of 3.2×10−9 M. What is the hydroxide ion concentration of the solution? Write your answer in scientific notation. Use the multiplication symbol rather than the letter x in your answer. Report your answer two significant figures.

3.1 × 10⁻⁶ M

Explanation:

One water molecule can react as a base while other water molecule acts as an acid to form and hydronium ion and a hydroxide ion.

H₂O(l) + H₂O(l) ⇄ H₃O⁺(aq) + OH⁻(aq)

The equilibrium constant (Kw), known as the ionic product of water, has the following form:

Kw = [H₃O⁺] × [OH⁻]

The value of Kw at 25°C is 1.0 × 10⁻¹⁴.

An aqueous solution at 25°C has a hydronium ion concentration of 3.2 × 10⁻⁹ M. The hydroxide concentration is:

Kw = [H₃O⁺] × [OH⁻]

1.0 × 10⁻¹⁴ = 3.2 × 10⁻⁹ × [OH⁻]

[OH⁻] = 3.1 × 10⁻⁶ M

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.