Question

What is the ph of household ammonia in which the [h3o ] is 1.0x10-12 m?

Answer 1

Data:
$pH = ?$
$[ H_{3} O] = 1.0*10^{-12}$
The logarithm of number 1 on any basis will always be equal to 0, therefore: Log10 (1) = 0

Solving:
$pH = - log[ H_{3} O^+]$
$pH = -log1.0*10^{-12}$
$pH = 12 - log1.0$
$pH = 12 - 0$
$\boxed{\boxed{pH = 12}}\end{array}}\qquad\quad\checkmark$

Note: For pH greater than 7 indicates that the substance is basic (pH > 7)