Multiple Choice
In which of the following ionic compounds is nitrogen present?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for titanium(III) oxide?
A
TiO2
B
TiO
C
Ti3O2
D
Ti2O3
Verified step by step guidance1
Identify the oxidation state of titanium in titanium(III) oxide. The Roman numeral III indicates that titanium has a +3 charge, so Ti is Ti^{3+}.
Determine the charge on the oxide ion. Oxygen typically forms an oxide ion with a charge of -2, so O is O^{2-}.
To write the correct formula, balance the total positive and negative charges so the compound is electrically neutral. Set up the equation: (number of Ti ions) \times (+3) + (number of O ions) \times (-2) = 0.
Find the smallest whole number ratio of Ti to O that satisfies the charge balance. For example, if you have 2 Ti^{3+} ions, their total positive charge is +6; to balance this, you need 3 O^{2-} ions with a total negative charge of -6.
Write the formula using the ratio found: Ti_{2}O_{3}. This represents titanium(III) oxide with the correct stoichiometric ratio to balance charges.
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