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Plumbate ion has a formula of Pb(OH)6 2-, while plumbite ion has a formula of Pb(OH)4 2-. The difference lies in the oxidation state of lead, which is +6 in plumbate and +4 in plumbite.
Pb(OH)2-6 or PbO2-3 or PbO4-4 . More information is available, should you wish it, on the wikipedia plumbate page.
The chemical formula difference between baking soda and baking powder is that baking soda is sodium bicarbonate (NaHCO3) while baking powder is a mixture of sodium bicarbonate and an acid, such as cream of tartar.
There is no difference between H2O and water. H2O is the chemical formula for water, with each molecule consisting of two hydrogen atoms bonded to one oxygen atom.
The formula for sodium stannate is Na2SnO3, while the formula for sodium stannite is Na2SnO2. The key difference between the two is the oxidation state of tin: in stannate, tin is in the +4 state, and in stannite, tin is in the +2 state.
To determine the difference between an ionic and a covalent compound from its chemical formula, you can look at the elements involved. Ionic compounds typically involve a metal and a nonmetal, while covalent compounds involve nonmetals only. Additionally, if the compound contains a metal combined with a polyatomic ion, it is likely ionic.