Q) Iodine can be extracted from some types of seaweed which have taken up iodide compounds from the sea water. Iodide is present in seawater as both iodide I- and iodate ions IO3-.
Give the oxidation state of iodine in I- and IO3-
a) I-: -1 IO3-: +7
Q) IO3- + 3SO2- ==> 6H+ + 3SO4 (2-) + I-
Which element has been oxidised in the reaction?
a) Sulfur
Q) This equation is the incomplete half equation for the conversion of iodate ions to iodide ions.
a) IO3- + 6H+ +6e- ==> I- + 3H20
Q) Chlorine atoms are more readily reduced than iodide atoms.
State what is mean't by reduction in terms of electrons.
a) Reduction is the gain of electrons.
Q) Suggest why Chlorine atoms are more readily reduced than iodide atoms.
Chlorine is a smaller atom with less sheilding than Iodine, and therefore it's nucleus can attract the electron it needs to be reduced more strongly than Iodine.
Comments
No comments have yet been made