Complete the exercises below. a. Determine the number of sodium ions in the chemical formula of albite, NaₓAlSi₃O₈ b. Determine the number of hydroxide ions in the chemical formula of tremolite, Ca₂Mg₅(Si₄O₁₁)₂(OH)ₓ.

Chemical formulas represent the composition of a compound, indicating the types and numbers of atoms present. In the case of albite, NaₓAlSi₃O₈, the subscript 'x' denotes the variable number of sodium ions, which can vary based on the specific mineral composition. Understanding how to interpret these formulas is essential for determining the number of specific ions in a compound.

Ionic compounds are formed from the electrostatic attraction between positively charged ions (cations) and negatively charged ions (anions). In tremolite, Ca₂Mg₅(Si₄O₁₁)₂(OH)ₓ, the hydroxide ion (OH⁻) acts as an anion, and its quantity is determined by the overall charge balance of the compound. Recognizing the roles of cations and anions is crucial for analyzing the chemical formulas.

Charge balance is a fundamental principle in chemistry that states the total positive charge must equal the total negative charge in a neutral compound. For tremolite, the number of hydroxide ions (OH⁻) must be calculated to ensure that the overall charge of the compound is neutral. This concept is vital for determining the correct stoichiometry in ionic compounds.