Numbers and quantity and correlation with Concetration

Numbers and Quantities Important:

Leaning objective :
• To give an overview of some relevant units and numerical terms used in medicinal chemistry.

in this lecture we will study: moles, ancient and modern; Concentrations, weak and strong; ppm and Dilution, all with a standard notation, with a touch of Mystery and unknown , a little Laughing and a lot of Grief!
1. standarad notations, power of 10:

The measurement of quantities in science have been standardized, although some older texts and lecturers still use old notations. We have included both in the text where appropriate.

1.1 Numbers and multiples of 10 in common use:
2. mole :
A mole is a made-up unit to describe such a huge number that it is difficult to write in text in ordinary notation with all its zeros. A mole was derived to try to overcome the difficulty of imagining such large numbers. A mole of particles is 6 x 10 23 of them. The term is used when talking about the number of particles, atoms or molecules present in a material. You can have a mole of anything as it has no units of its own, so you can have a mole of oranges or of people. A mole has no units because it is a number, just like ‘12’ is a number - you can have 12 oranges or 12 people.