sactivity-67-372w828690-1622404247-1.ppt

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1. Experimental No.2
Part I:-
Preparation of copper (II) iodate
dihydrate Cu(IO
3)
2 .2H
2O

2. Copper is
a chemical element  with symbol Cu and atomic
number 29.
It is a ductile metal with very high
thermal and electrical
conductivity. Pure copper is soft and
malleable;
a freshly exposed surface has a reddish-orange color.
It
is used as a conductor of heat and electricity.


Iodine
is a chemical element with symbol I and atomic number
53,



Electronic
configuration is= {[Kr]
36

4d
10
5s
2
5p
5
},
• its
melting point is 113.7 °C. And boiling point 184.3°C.

3. • Oxidation state Iodine adopts a variety of oxidation
states, commonly ranging from (formally) (+7) to (-1),
and including the intermediate states of (+5), (+3) and
(+1).
Iodine
oxidation
state
-1 0 +1 +3 +5 +7
Name Potassium
iodide
iodine Potassium

hypoiodite
Potassium
iodite
Potassium
iodate
Potassium

periodate
Formula KI I
2
KIO KIO
2
KIO
3
KIO
4

4. •An
 iodate is a conjugate base of iodic acid. In the
iodate
 anion, iodine is bonded to three
 
oxygen atoms and the molecular formula is IO
3
−
.
The molecular geometry of iodate is trigonal
pyramidal.

5. •Preparation:-
•copper iodate are prepared by adding excess of KIO
3
solution to concentrated Cu (NO
3)
2 by (double
replacement reaction)
Cu (NO
3)
2.3H
2O +2KIO
3 Cu (IO
3)
2 .2H
2O+2KNO
3+ H
2O

6. •Procedure:-
1- Dissolve (0.25 gm) of cupric nitrate {Cu (NO
3)
2.3H
2O} in
(6 ml) of water.
2- Dissolve (0.75 gm) of potassium iodate (KIO
3) in (15 ml)
of water, heat the solution then add to the first solution
with continues stirring until the crystal of
{Cu(IO
3)
2 .2H
2O}are precipitate.
3 – Cool the solution, then filter the precipitate, wash the
ppt. with water and dry it in oven.
4- Calculate the yield percentage and %error.