Question

Chapter -2 Acids, bases and salts

Class 10

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If pH of a sodium is 14, then it is a ______​

Answer 1

Explanation:

Auto-Ionization of Water

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).

Answer 2

Answer:

The Effective Range of the pH Scale

For example, at a pH of zero the hydronium ion concentration is one molar, while at pH 14 the hydroxide ion concentration is one molar. ... One can go somewhat below zero and somewhat above 14 in water, because the concentrations of hydronium ions or hydroxide ions can exceed one molar.