# How should you dilute concentrated acid?

Dec 31, 2015

The best advice I can give you:

$\text{If you spit in acid it spits backs at you!}$

I am not making a joke.

#### Explanation:

The order of addition is important. A small drop of water in conc. acid will heat rapidly as the bulk acid hydrates, and it may spit. On the other hand, when conc. acid is added to water, the BULK of the water heats up; it will still heat up, but it will do so gradually.

Here is another piece of juvenile doggerel:

$\text{May her rest be long and placid,}$
$\text{She added water to the acid.}$
$\text{The other girl did as she oughter,}$
$\text{She added acid to the water.}$

I can't stress how important this is. You get a drop of hot nitric acid in your eye, that's your eye gone. So don't spit in the acid!

It goes without saying, that when you do such operations, you MUST wear safety spectacles, and a laboratory coat to protect your clothing.