A solution is made by mixing 15.0 g of Sr(OH)2 and 55.0 mL of 0.200 M HNO3. c. Is the resulting solution acidic or basic?

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Calculate the moles of Sr(OH)_2 using its molar mass.

Calculate the moles of HNO_3 using its molarity and volume.

Write the balanced chemical equation for the reaction: Sr(OH)_2 + 2HNO_3 -> Sr(NO_3)_2 + 2H_2O.

Determine the limiting reactant by comparing the mole ratio from the balanced equation.

Determine if there is an excess of HNO_3 or Sr(OH)_2 to decide if the solution is acidic or basic.

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Key Concepts

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

Acid-Base Reactions

Acid-base reactions involve the transfer of protons (H⁺ ions) between reactants. In this case, HNO3 is a strong acid that dissociates completely in solution, while Sr(OH)2 is a strong base that also dissociates completely. The reaction between them will determine the resulting pH of the solution, indicating whether it is acidic or basic.

Stoichiometry

Stoichiometry is the calculation of reactants and products in chemical reactions. To determine if the solution is acidic or basic, one must calculate the moles of HNO3 and Sr(OH)2 present. This involves converting grams of Sr(OH)2 to moles and comparing the mole ratio of acid to base to see which is in excess.

pH Scale

The pH scale measures the acidity or basicity of a solution, ranging from 0 (very acidic) to 14 (very basic), with 7 being neutral. After determining the amounts of acid and base, the resulting pH can be calculated. A pH less than 7 indicates an acidic solution, while a pH greater than 7 indicates a basic solution.

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