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\begin{tabular}{|l|l|l|l|}
\hline
\multicolumn{1}{|c|}{ Chemical Name } & \multicolumn{1}{|c|}{ Chemical Formula } & \multicolumn{1}{c|}{ Chemical Name } & \multicolumn{1}{c|}{ Chemical Formula } \\
\hline
acetate & [tex]$C _2 H _3 O _2^{-}$[/tex] & nitrite & [tex]$NO _2^{-}$[/tex] \\
\hline
carbonate & [tex]$CO _3{ }^{2-}$[/tex] & ammonium & [tex]$NH _4^{+}$[/tex] \\
\hline
hypocarbonite & [tex]$CO ^{2-}$[/tex] & cyanide & [tex]$CN ^{-}$[/tex] \\
\hline
\begin{tabular}{l}
hydrogen carbonate \\
(bicarbonate)
\end{tabular} & [tex]$HCO _3^{-}$[/tex] & hydroxide & [tex]$OH ^{-}$[/tex] \\
\hline
chlorite & [tex]$ClO _2^{-}$[/tex] & peroxide & [tex]$O _2{ }^{2-}$[/tex] \\
\hline
hypochlorite & [tex]$ClO ^{-}$[/tex] & phosphate & [tex]$PO _4{ }^{3-}$[/tex] \\
\hline
chlorate & [tex]$ClO _3^{-}$[/tex] & hydrogen phosphate & [tex]$HPO _4{ }^{2-}$[/tex] \\
\hline
perchlorate & [tex]$ClO _4^{-}$[/tex] & dihydrogen phosphate & [tex]$H _2 PO _4^{-}$[/tex] \\
\hline
\end{tabular}

Select the correct answer.

What is the chemical formula of the compound copper(II) phosphate? Use the list of polyatomic ions and the periodic table to help you answer.

A. [tex]$Cu _3\left( PO _4\right)$[/tex]
B. [tex]$Cu \left( PO _4\right)_2$[/tex]
C. [tex]$Cu _2\left( PO _4\right)_2$[/tex]
D. [tex]$Cu _3\left( PO _4\right)_2$[/tex]



Answer :

GinnyAnswer
To determine the correct chemical formula for copper(II) phosphate, we need to balance the charges of the copper ions (Cu^2+) and the phosphate ions (PO4^3-).

1. Identify the charges of the ions:
- Copper(II) ion: Cu^2+ (indicates a 2+ charge per copper ion).
- Phosphate ion: PO4^3- (indicates a 3- charge per phosphate ion).

2. Determine the ratio needed to balance the charges:
- We need multiple ions such that the total positive charge equals the total negative charge.
- If we have 3 Cu^2+ ions, the total positive charge will be [tex]\(3 \times 2^+ = 6^+\)[/tex].
- If we have 2 PO4^3- ions, the total negative charge will be [tex]\(2 \times 3^- = 6^-\)[/tex].

3. Write the chemical formula:
- By combining 3 Cu^2+ ions and 2 PO4^3- ions, the charges will balance out.
- Therefore, the chemical formula for copper(II) phosphate will be [tex]\(Cu_3(PO_4)_2\)[/tex].

The correct answer is:
D. [tex]\(Cu_3(PO_4)_2\)[/tex]

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