Multiple Choice
Which of the following is the correct formula for the ionic compound formed when Mg^{2+} reacts with P^{3-}?
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3. Chemical Reactions
Writing Ionic Compounds
Multiple Choice
Which of the following is the correct chemical formula for the ionic compound formed between Cu^{2+} and P^{3-} ions?
A
Cu_2P
B
CuP
C
Cu_3P_2
D
Cu_2P_3
Verified step by step guidance1
Identify the charges on the ions involved: copper ion is Cu^{2+} and phosphide ion is P^{3-}.
Determine the ratio of ions needed to balance the total positive and negative charges so that the compound is electrically neutral.
Set up the charge balance equation: (number of Cu^{2+} ions) \(\times\) (+2) + (number of P^{3-} ions) \(\times\) (-3) = 0.
Find the smallest whole number ratio of Cu^{2+} to P^{3-} ions that satisfies the charge balance. This involves finding the least common multiple of the charges 2 and 3.
Write the chemical formula using the ratio found, placing the number of each ion as subscripts: Cu_{3}P_{2}.
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