Multiple Choice
Which of the following is the correct chemical formula for barium phosphide?
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3. Chemical Reactions
Naming Ionic Compounds
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What is the correct chemical formula for cobalt(III) chlorate?
A
Co(ClO3)3
B
CoCl3
C
Co3(ClO3)2
D
Co2(ClO3)3
Verified step by step guidance1
Identify the oxidation state of cobalt in cobalt(III). The Roman numeral III indicates cobalt has a +3 charge, so the cation is Co^{3+}.
Recognize the chlorate ion, which is a polyatomic ion with the formula ClO_3^{-} and a charge of -1.
Determine the number of chlorate ions needed to balance the +3 charge of the cobalt ion. Since each chlorate ion has a -1 charge, three chlorate ions are required to balance one Co^{3+} ion.
Write the chemical formula by placing the cobalt ion first, followed by the chlorate ion in parentheses with a subscript of 3 to indicate three chlorate ions: Co(ClO_3)_3.
Confirm that the total positive and negative charges balance to zero, ensuring the formula is electrically neutral.
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