What is the molarity of Br^- in each solution? b. 0.150 M CaBr₂

Key Concepts

Molarity

Molarity is a measure of concentration defined as the number of moles of solute per liter of solution. It is expressed in units of moles per liter (M). Understanding molarity is essential for calculating the concentration of ions in a solution, as it allows for the conversion between moles of solute and the volume of the solution.

Dissociation of Ionic Compounds

Ionic compounds, such as calcium bromide (CaBr2), dissociate into their constituent ions when dissolved in water. For CaBr2, it dissociates into one calcium ion (Ca²⁺) and two bromide ions (Br⁻). This dissociation is crucial for determining the concentration of specific ions in solution, as the number of ions produced depends on the stoichiometry of the compound.

Stoichiometry

Stoichiometry involves the calculation of reactants and products in chemical reactions based on balanced equations. In the context of solutions, stoichiometry helps in determining the molar ratios of ions produced from the dissociation of compounds. For example, knowing that 1 mole of CaBr2 produces 2 moles of Br⁻ allows for the calculation of the molarity of bromide ions in the solution.