Writing Chemical Formula Worksheet With Answer Key - Spes Unica Page 21
ADVERTISEMENT
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28Using concentration
LI 12
E
As we now have a standard amount of any substance we can now work out
the concentration of a solution.
Concentration is a measure of how much solute is dissolved in the
solution. The more dissolved the higher the concentration.
As the amount of solid is the Mole, then the concentration is measured as
the number of moles of solute dissolved in 1 litre of solution. The unit
-1
is Moles per litre (mol/l) sometimes written as mol l
.
i.e. A solution labelled as 1 mol/l contains 1 mole of substance dissolved in
one litre of water
For any solution, the concentration can be calculated by using the
following equation
Concentration = number of moles
Volume (in litres)
Rearranging gives
number of moles= Concentration x Volume (in litres)
These equations can be summarised in the triangle
Example 1: How many moles are there in 100 cm 3 of sodium hydroxide
solution, concentration 0.4 mol l -1 ?
Number of moles = Concentration x Volume (in litres)
= 0.4 x (100÷1000)
= 0.4 x 0.1
= 0.04 moles
21
ADVERTISEMENT
0 votes
Related Articles
Related forms
Related Categories
Parent category: Education