What is a Standard Solution

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 What is a Standard Solution
A standard solution is a solution whose
concentration is accurately and well known, that is a solution that contains a
known mass of a solute dissolved in a known volume of solution. For example, a
solution that contains 22g of sodium Chloride (NaCl) in 1 dm Cube of a solution
is a standard solution. A solution containing 3.2g of potassium trioxocarbonate
(IV) salt in 250cm3 of a solution of water is also a
standard solution. In order to prepare a standard solution in the laboratory,
you must understand vividly the disparity or differences that exist between
Molarity and volume of a solution after it has been diluted.

MOLARITY according to molar concept can be
defined as the moles of a solute per unit Volume of a solution when dissolved
in 1 dm3 of the solution. A concentrated solution is one
that contains a large amount  of solute
dissolved in its solvent  while a
dilute  solution is one that
contains  a small amount of the solute
particle dissolve in its solvent.
When water is used to dilute a concentrated
solution, the concentration of the solution actually experience a decrease, but
the amount or mole of the dilute solution remains the same with the amount or
moles of the concentrated solution.
Therefore,
the number of moles
in Concentrated solution  =======the
number of moles in dilute solution
That’s
ok lets move on, For any dilution of any concentrated solution, the
relationship between the concentration  and  volume
of the concentrated and dilute solution is
C1
V1 ====================C2V2
Before
dilution  ============after dilution
 Now haven learn the above, lets have a simple
problem,
1.  
Calculate
the volume of 0.07mol/dm3  solution obtained when 200cm3 of 0.5 mol/dm3
tetraoxosulphate (VI) acid is diluted.
SOLUTION
C1V1=======C2V2
Concentration
before dilution C1—-0.5
Volume
before dilution V1———–200cm3
Concentration
after dilution C2—–0.007mol/dm3
Volume
after dilution——————–?
 Therefore formularly, C1V1====C2V2
0.5
X 200 === 0.07 XV2
V2===========
0.5 x200
                                      0.07
V2============1428.6cm3 
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