what is the chemical formula for zinc phosphate?


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Zinc phosphate is an inorganic chemical compound used as a corrosion resistant coating on metal surfaces either as part of an electroplating process or applied as a primer pigment (see also red lead). It has largely displaced toxic materials based on lead or chromium, and by 2006 it had become the most commonly used corrosion inhibitor. Zinc phosphate coats better on a crystalline structure than bare metal, so a seeding agent is often used as a pre-treatment. One common agent is sodium pyrophosphate. So, what is the chemical formula for zinc phosphate? 


Zinc phosphate is an ionic compound .To write the formula of ionic compound first write the symbol of element or formula of polyatomic ion .


Zinc is transition metal and phophate is a polyatomic ion with formula PO4^3- .


Zn  always form Zn 2+ ion ( so it a cation )



Now next step is  drop and swap method : which means first drop the the charge on the cation make sure only the number and ignore the + sign and then swap it to the anion similary drop the charge on the anion and swap it to the cation.

Charge on cation and anion respectively ,                                    Zn^2+     PO4 ^3- 

  Droped the charge of the Zn                                                           Zn 2      PO4^3-   

Swaped the charge '2' of the Zn cation to the Anion PO4^3-         Zn  (PO4^3-)2

Similary drop the charge on PO4^3-                                                 Zn (PO43)2  

Now swape it to the cation  Zn                                                      Zn3(PO4)2

 Zn3(PO4)2 - You got the formula of the ionic compound !!!!!


Chemical fomulla for Zinc Phosphate Zn3(PO4)2.
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