# What is the hydronium ion concentration of a solution whose pH is 4.12?

##### 2 Answers

#### Answer:

#### Explanation:

By definition,

Historically, before the days of electronic calculators, log tables were habitually used by chemists, and mathematicians, and engineers, and students because logarithmic functions allowed fairly speedy calculation of products and quotients.

AS a bit of background, when we write

And thus ...............................................................

Note that you still have to plug that value into a calculator, and raise

#### Answer:

#### Explanation:

Take the formula:

and isolate

Since yo only have 3 sig figs the answer would be: