Question

Change in pH from 3 to 1 increase the H*
concentration by
times.​

Answer 1

Answer:

Because of its amphoteric nature (i.e., acts as both an acid or a base), water does not always remain as H2O molecules. In fact, two water molecules react to form hydronium and hydroxide ions:

2H2O(l)⇌H3O+(aq)+OH−(aq)(1)

This is also called the self-ionization of water. The concentration of H3O+ and OH− are equal in pure water because of the 1:1 stoichiometric ratio of Equation 1 . The molarity of H3O+ and OH- in water are also both 1.0×10−7M at 25° C. Therefore, a constant of water ( Kw ) is created to show the equilibrium condition for the self-ionization of water. The product of the molarity of hydronium and hydroxide ion is always 1.0×10−14 (at room temperature).

Kw=[H3O+][OH−]=1.0×10−14(2)

Equation 2 also applies to all aqueous solutions. However, Kw does change at different temperatures, which affects the pH range discussed below.

Explanation:

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