A student mixes 100 mL of 0.20 M HCl with different volumes of 0.50 M NaOH. Are the final soluti

step 1 Question number five asks you to determine whether or not the final solution is acidic, basic, o

A student mixes 100 mL of 0.20 M HCl with different volumes...

A student mixes 100 $\mathrm{mL}$ of 0.20 $\mathrm{M}$ HCl with different volumes of 0.50 $\mathrm{M}$ NaOH. Are the final solutions acidic, basic, or neutral? Explain your thinking. a. 100 $\mathrm{mL}$ of $0.20 \mathrm{M} \mathrm{HCl}+20 \mathrm{mL}$ of 0.50 $\mathrm{M} \mathrm{NaOH}$ b. 100 $\mathrm{mL}$ of $0.20 \mathrm{M} \mathrm{HCl}+40 \mathrm{mL}$ of 0.50 $\mathrm{M} \mathrm{NaOH}$ c. 100 $\mathrm{mL}$ of $0.20 \mathrm{M} \mathrm{HCl}+60 \mathrm{mL}$ of 0.50 $\mathrm{M} \mathrm{NaOH}$

A student mixes 100 $\mathrm{mL}$ of 0.20 $\mathrm{M}$ HCl with different volumes of 0.50 $\mathrm{M}$ NaOH. Are the final solutions acidic, basic, or neutral? Explain your thinking.
a. 100 $\mathrm{mL}$ of $0.20 \mathrm{M} \mathrm{HCl}+20 \mathrm{mL}$ of 0.50 $\mathrm{M} \mathrm{NaOH}$
b. 100 $\mathrm{mL}$ of $0.20 \mathrm{M} \mathrm{HCl}+40 \mathrm{mL}$ of 0.50 $\mathrm{M} \mathrm{NaOH}$
c. 100 $\mathrm{mL}$ of $0.20 \mathrm{M} \mathrm{HCl}+60 \mathrm{mL}$ of 0.50 $\mathrm{M} \mathrm{NaOH}$

Key Concepts

Acid-Base Neutralization

This concept explains how acids and bases react to form water and a salt, often leading to a neutralization reaction. In such reactions, the acid donates a proton (H+) to the base, leading to the formation of water. Understanding the neutralization mechanism is essential for predicting the outcome when different volumes and concentrations of acid and base are mixed.

Stoichiometric Calculations

Stoichiometry involves calculating the number of moles of reactants (acid and base in this case) based on their volume and concentration. This allows one to determine how many moles of acid are available to react with the available moles of base, which is crucial in predicting whether any excess acid or base remains after the reaction.

Limiting Reactant

The limiting reactant is the substance that is completely consumed in a chemical reaction, limiting the amount of product formed. In mixing acid and base solutions, determining which reactant is in deficit is key to establishing whether the final solution contains an excess of acid or base, thereby defining if the solution will be acidic, basic, or neutral.

Excess Reactant and pH Considerations

Once the limiting reactant has been identified and the neutralization reaction is complete, any remaining excess reactant will determine the pH of the final solution. An excess acid will result in an acidic solution and an excess base in a basic solution. When stoichiometric amounts are mixed, the reaction is complete, often leading to a neutral solution.

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