What Is the Correct Formula for Magnesium Phosphate?

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The discussion centers on the correct chemical formula for magnesium phosphate, which is identified as Mg3(PO4)2, not Mg3(PO5)2 as initially written. Participants clarify that the correct formula involves the phosphate ion PO4^3-, and emphasize the importance of using the criss-cross rule when combining ions. Additionally, the acids mentioned, "Chlorhydric acid" and "Iodhydric acid," are clarified to be common names for hydrochloric acid (HCl) and hydroiodic acid (HI), respectively. The conversation highlights the significance of accurate chemical notation and understanding ion forms in chemistry.
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Everyone keeps telling me I am writing this formula down wrong but it is one my teacher gave to figure out...am I wrong and what formula name is it?

Mg3(PO5)2

Also not sure what chemical formula for these two are any help would be great

1. Chlorhydric acid
2. Iodhydric acid
 
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It is suppose to be Mg3(PO4)2. Notice the 4 instead of 5. There is no such thing as the acids you mentioned. I think you mean Hydrochloric and Hydroiodic acids, they are HCl and HI
 
simhank said:
Everyone keeps telling me I am writing this formula down wrong but it is one my teacher gave to figure out...am I wrong and what formula name is it?

Mg3(PO5)2

Also not sure what chemical formula for these two are any help would be great

1. Chlorhydric acid
2. Iodhydric acid

You shud write the 2 molecules in their ion form, it will help you to write the formula out right: Mg+2 + PO4^3- = Mg3(PO4)2, use the criss-cross rule especially when working with polyatomic ions. Also, the there are only 2 forms PO4^3- and PO4^2-.

Those acids are just common industry names for HCl and HI.

Hope this helps :)
 
ok Thanks for your help
 

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