Multiple Choice
When water ionizes, it produces an ion with a positive charge and an ion with a negative charge. Which pair of ions is formed?
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2. Atoms & Elements
Ions
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In the compound Cr3(PO4)4, which species is the cation and which is the anion?
A
Both Cr3+ and PO4^{3-} are cations.
B
Cr3+ is the cation and PO4^{3-} is the anion.
C
PO4^{3-} is the cation and Cr3+ is the anion.
D
Both Cr3+ and PO4^{3-} are anions.
Verified step by step guidance1
Identify the components of the compound Cr3(PO4)4. Here, Cr represents chromium ions and PO4 represents phosphate ions.
Recall that cations are positively charged ions and anions are negatively charged ions. The charge on chromium in this compound is given as Cr^{3+}, indicating it is a cation.
The phosphate ion, PO4^{3-}, carries a negative charge, which means it is an anion.
Since the compound is electrically neutral overall, the positive charges from the chromium cations balance the negative charges from the phosphate anions.
Therefore, in Cr3(PO4)4, Cr^{3+} is the cation and PO4^{3-} is the anion.
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