concentration, molarity

Concentration of a solution is defined as “the amount of solute in a certain amount of solution”. Therefore, there are many types of concentration such as :
- mass of solute / volume of solution
- mass of solute / mass of solution
- volume of solute / volume of solution
- no. of moles of solute / volume of solution
- no. of moles of solute / mass of solution
…….. etc.
Conclusively, concentration = (amount of solute) / (amount of solution)
and the “amount” can be mass (in any unit), volume (in any unit), no. of moles, etc.

Molarity of a solution is specific type of concentration. In molarity, the amount of solute must be no. of moles of the solute, and the amount of solution must be volume of the solution in dm³.

2010-06-10 13:16:54 補充：
Calculation of pH must be based on molarity.

2010-06-12 05:49:24 補充：
In Form 4, you can do in this way.

我今年都係F.4 ga^_^
Nice to meet you~
阿sir話呢考試、會考、高考、同我牠ge文憑試呢
If 問concentration你可以答
mass of solute(g) / volume of solution(dm^3)
or
no. of moles of solute / vol. of solution (dm^3)

但係問molarity 就一定要答
no. of moles of solute / vol. of solution (dm^3)

有時題目問concentration，
以(g/dm^3)表示就一定要答
mass of solute(g) / volume of solution(dm^3)


其實兩種計法都係顯示濃度而己
但考慮ge factors不同
一個係mass，一個係mole

一句講哂睇題la
(我阿sir教ge係為"考試而考試")
Hope this can help you^_^