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Ch.2 - Atoms, Molecules, and Ions
Brown - Chemistry: The Central Science 14th Edition
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232Not the one you use?Change textbook
All textbooksBrown 14th EditionCh.2 - Atoms, Molecules, and IonsProblem 62e
Chapter 2, Problem 62e

Predict the chemical formulas of the compounds formed by the following pairs of ions: (e) Ti4+ and O2-.

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Identify the charges of the ions: Ti^{4+} has a charge of +4 and O^{2-} has a charge of -2.
Determine the ratio of ions needed to balance the charges. Since Ti^{4+} has a +4 charge and O^{2-} has a -2 charge, you need two O^{2-} ions to balance one Ti^{4+} ion.
Write the chemical formula by placing the cation first followed by the anion. Use subscripts to indicate the number of each ion needed to balance the charges.
The chemical formula is written as TiO_{x}, where x is the number of O^{2-} ions needed to balance the charge of one Ti^{4+} ion.
Since two O^{2-} ions are needed to balance one Ti^{4+} ion, the chemical formula is TiO_{2}.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Ionic Compounds

Ionic compounds are formed when positively charged ions (cations) and negatively charged ions (anions) combine. The overall charge of the compound must be neutral, meaning the total positive charge must balance the total negative charge. Understanding how to combine these ions based on their charges is essential for predicting the correct chemical formula.
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Charge Balance

Charge balance is a fundamental principle in chemistry that dictates how ions combine to form neutral compounds. For example, if a cation has a charge of +4 (like Ti4+) and an anion has a charge of -2 (like O2-), the ratio of ions must be adjusted so that the total positive charge equals the total negative charge, leading to the correct stoichiometry in the formula.
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Empirical Formula

The empirical formula represents the simplest whole-number ratio of the elements in a compound. When predicting the formula for the compound formed by Ti4+ and O2-, one must determine the lowest ratio of titanium to oxygen that results in a neutral compound, which is crucial for accurately expressing the compound's composition.
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Related Practice
Textbook Question

Complete the table by filling in the formula for the ionic compound formed by each pair of cations and anions, as shown for the first pair. Ion Na+ Ca2+ Fe2+ Al3+ O2- Na2O NO3- SO42- AsO43-

Textbook Question

Predict the chemical formulas of the compounds formed by the following pairs of ions: (a) Cr3+ and CN- (b) Mn2+ and ClO4-

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Predict the chemical formulas of the compounds formed by the following pairs of ions: (c) Na+ and Cr2O72-

Textbook Question

Predict the chemical formulas of the compounds formed by the following pairs of ions: (d) Cd2+ and CO32-

Textbook Question

Complete the table by filling in the formula for the ionic compound formed by each pair of cations and anions, as shown for the first pair. Ion K+ NH4+ Mg2+ Fe3+ Cl- KCl OH- CO32- PO43-

Complete the first row of the table.

Complete the second row of the table.

Complete the third row of the table.

Complete the fourth row of the table.

Textbook Question

Predict whether each of the following compounds is molecular or ionic: (a) HClO4