Asolution has a [oh−] of 1 × 10−12 m. what is the [h3o+] of the solution?

a 1 × 10−14 m
b 1 × 10−2 m
c 2 m
d 14 m

 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

The correct answer is Option B.

Explanation:

To calculate the pH of the solution, we need to determine pOH of the solution. To calculate pOH of the solution, we use the equation:

We are given:

Putting values in above equation, we get:

To calculate pH of the solution, we use the equation:

pH is defined as negative logarithm of hydrogen ion or hydronium ion concentration. It is basically defined as the power of hydronium ions in a solution.

pH of the solution = 2

Putting values in above equation, we get:

Hence, the correct answer is Option B.