SCH 3U - Nomenclature - Radicals

Many of the previously introduced complex anions may be made into radicals by the addition or removal of oxygen atoms from the anion formula.  Depending on the number of oxygen atoms added or removed, the radicals will have names derived from the original name of the complex anion (per…ate, …ate, …ite, hypo…ite).  Notice that the charge on the anion does not change when oxygen atoms are added or removed.

SO₅^2-  persulfate         ClO₄^-     perchlorate     👉1 more O atom than ‘-ate’

SO₄^2-       sulfate         ClO₃^-          chlorate     👉original complex anion (‘-ate’)

SO₃^2-         sulfite         ClO₂^-          chlorite      👉1 less O atom than ‘-ate’

SO₂^2- hyposulfite         ClO^-    hypochlorite     👉2 less O atoms than ‘-ate’

Rules for Writing a Name from a Formula

1.     Write exactly the same way as for binary compounds.

2.    Apply the Stock rules if the first element has more than one valence.

ex.(a)  NaNO₂        sodium nitrite                    

* NO₃^- is nitrate, so removing 1 oxygen atom gives NO₂^-, which is nitrite

 

     (b)  Cu(ClO₄)₂    copper (II) perchlorate 

* ClO₃^- is chlorate, so adding 1 oxygen atom gives ClO₄^-, which is perchlorate

Rules for Writing a Formula from a Name

1.     Write exactly the same way as for binary compounds.

2.    Apply the Stock rules if necessary.

ex.(a)  potassium hypophosphite       K¹   PO₂³ ↝  K₃PO₂

 

     (b)  iron (III) sulfite                        Fe³  SO₃² ↝  Fe₂(SO₃)₃

 

Dude!  Wanna see sumthin' radical?? Check this out!

Homework

  

Give the correct formula for the following.

1.     sodium chlorite

2.    iron (III) carbonate

3.    calcium persulfate

4.    mercury (I) perchlorate

5.    manganese (II) nitrite

6.    iron (III) phosphate

7.    ammonium nitrate

8.    zinc hypochlorite

9.    potassium phosphite

10.  iron (III) sulfate

11.  cobalt (II) chlorite

12.  copper (II) hypophosphite

13.  nickel (III) perchlorate

14.  copper (I) perchlorate

15.  tin (IV) hypochlorite

16.  sodium phosphite

17.  potassium permanganate

18.  tin (II) nitrate

19.  sodium nitrite

20. calcium carbonate

Give the correct name for the following.

1.     CuClO₂

2.    PbCO₃

3.    Na₃PO₂

4.    Sn(ClO₄)₄

5.    Ni(ClO₃)₃

6.    As(ClO₃)₃

7.    Bi₂(SO₂)₅

8.    Cu₃(PO₂)₂

9.    Co(ClO₃)₂

10.  Fe₂(SO₅)₃

11.  CrCO₃

12.  K₃PO₅

13.  Zn(ClO)₂

14.  FePO₃

15.  Mn(NO)₄

16.  HgClO₃

17.  CaSO₄

18.  Fe₂(CO₃)₃

19.  MgSO₄

20. NaClO

 

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