For CaSO4 (calcium sulfate), the oxidation number of sulfur is +6. For SO4 (sulfate ion), the oxidation number of sulfur is +6. For SO2 (sulfur dioxide), the oxidation number of sulfur is +4. For SO3 (sulfur trioxide), the oxidation number of sulfur is +6.
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In CaSO4, the oxidation number of Ca is +2, the oxidation number of S is +6, and the oxidation number of O is -2.
The oxidation number of sulfur (S) in CaSO4 (calcium sulfate) is +6. This is because calcium (Ca) has an oxidation number of +2 and oxygen (O) almost always has an oxidation number of -2. Therefore, the sum of the oxidation numbers must equal zero for the compound CaSO4.
The oxidation number of calcium (Ca) is +2. The overall charge of a sulfate ion (SO4) is -2. Therefore, in CaSO4, calcium has an oxidation number of +2 and sulfate has an oxidation number of -2.
CaSO4 (is Calcium Sulphate) Ca = 1 x calcium S = 1 x sulphur O = 4 x oxygen NB Do NOT confuse with copper sulphate , which is 'CuSO4'. There is only one lower case letter difference.
CaSO4 is Calcium Sulphate. Do not confuse with :- CaSO3 which is Calcium Sulphite CaS which is Calcium sulphide. Note the ONE letter difference in the sulphur anion spelling.