In H2O molecule, two water molecules are bonded by a Hydrogen bond but the bond between two H - O bonds within a water molecule are covalent
Answer:
A. Changing water from liquid to solid is an example of a physical change
Explanation:
Acid, however it is quite weak. Water's pH is somewhere between 5.4 and 7
Answer: 1 × 10−2 M
Explanation: Kw is known as the constant of water dissociation and its value is found to be
. It is the product of the concentration of [H3O+] and [OH -] ions .
Dissociation of water can be represented by -

Kw = [H3O+] [OH -]
As we know that pKw = - log Kw,
Thus pKw = 14
pOH = - log OH- = - log (10^{-12}) = 12
and pKw = pH + pOH
14 = pH + 12
pH = 14 - 12 = 2
pH = -log H3O+
2 = -log H3O+
Therefore, [H3O+] = 1 × 10−2 M