Answer: The chemical formula for potassium chromate is [tex]K_2CrO_4[/tex]
Explanation:
We are given some of the polyatomic ions with their oxidation states. Polyatomic ions are defined as the ions which are formed from the combination of more than 2 atoms.
We are asked to find the chemical formula for potassium chromate,
For this, only one polyatomic ion is used which is: Chromate having formula [tex]CrO_4^{2-}[/tex]
Potassium is the 19th element of the periodic table having electronic configuration of [tex][Ar]4s^1[/tex]
This element will easily loose 1 electron and will attain an oxidation state of +1 forming an ion of [tex]K^+[/tex]
By using criss-cross method, the oxidation state of the ions are exchanged and they form the subscripts of the other ions. This results in the formation of a neutral compound.
Hence, the chemical formula for this compound is [tex]K_2CrO_4[/tex]
Answer:
The formula for potassium chromate is [tex]K_2CrO_4[/tex].
Explanation:
The formula for potassium chromate :
Cation in the potassium chromate : Potassium
Anion in the potassium chromate : chromate
The symbol of potassium ion = [tex]K^+[/tex]
oxidation state on the potassium ion = +1
The symbol of chromate ion = [tex]CrO_4^{2-}[/tex]
Oxidation state on the chromate ion = -2
By criss-cross method, teh oxidation states of the ions gets exchanged and they form the subscripts of the other ions. This results in the formation of a neutral compound.
So, the formula for potassium chromate :[tex]K_2CrO_4[/tex]
[tex]2K^++CrO_4^{2-}\rightarrow K_2CrO_4[/tex]
