Ionic concentration / number of ions

[somasimple]

Hi all,

We use often concentrations in chemical/biological experiments.
It is expressed usually in mili/µ mole/cm3 or mm3

Is there a way to know the number of ions contained in a volume?
Is there a way to know the number of ions (or density) on a surface knowing the concentration?

Sorry for these basic questions.

[Borek]

What is mole definition?

[somasimple]

Mole: a chemical mass unit, defined to be 6.022 x 10E23 molecules, atoms, or some other unit.

Consider I'm stupid.

[Borek]

Mole: a chemical mass unit, defined to be 6.022 x 10E23 molecules, atoms, or some other unit.

Not a mass unit, quantity unit. But you are right - 6.02x1023 of elements. Just an overgrown dozen it is.

Do you know how to calculate number of moles of substance given volume of sample and concentration?

[somasimple]

I suppose.
If the concentration is 15 mMole then the number of molecules contained per unit of volume is:

(15/1000)*6.02x10E23

[Borek]

Wasn't that hard :wink:

[somasimple]

Sure but I'm so lazy...

[somasimple]

What is the volume unit on this page?
http://www.ncbi.nlm.nih.gov/books/bv.fcgi?rid=.0Doz_14FBoKlEE7VO_HAyJwxnZMXWZZQAN0H9

[Borek]

M usually stands for mol/liter.