Multiple Choice
What is the correct name for the compound with the formula KOH?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for nickel(II) carbonate?
A
Ni2CO3
B
Ni(CO3)2
C
NiCO3
D
Ni2(CO3)3
Verified step by step guidance1
Identify the charge on the nickel ion in nickel(II) carbonate. The (II) indicates that nickel has a charge of +2, so the ion is Ni^{2+}.
Determine the charge on the carbonate ion. The carbonate ion, CO_3, has a charge of -2, written as CO_3^{2-}.
To form a neutral compound, the total positive charge must balance the total negative charge. Since Ni^{2+} and CO_3^{2-} both have charges of magnitude 2 but opposite signs, they combine in a 1:1 ratio.
Write the chemical formula by combining one Ni^{2+} ion with one CO_3^{2-} ion, resulting in NiCO_3.
Verify that the formula is electrically neutral by confirming that the sum of charges is zero: (+2) + (-2) = 0.
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