Carbon dioxide in air can be removed by an aqueous metal...

Carbon dioxide in air can be removed by an aqueous metal hydroxide solution such as $\mathrm{LiOH}$ and $\mathrm{Ba}(\mathrm{OH})_{2} .$ (a) Write equations for the reactions. (Carbon dioxide reacts with water to form carbonic acid.) (b) Calculate the mass of $\mathrm{CO}_{2}$ that can be removed by $5.00 \times 10^{2} \mathrm{mL}$ of a $0.800 \mathrm{M} \mathrm{LiOH}$ and a $0.800 M \mathrm{Ba}(\mathrm{OH})_{2}$ solution. (c) Which solution would you choose for use in a space capsule and which for use in a submarine?

Key Concepts

Acid-Base Neutralization

Acid-base neutralization is the reaction in which an acid reacts with a base to produce water and a salt. In the context of CO2 removal, carbon dioxide dissolves in water to form carbonic acid, which is then neutralized by the metal hydroxide. This reaction underlies the mechanism by which CO2 is effectively removed from the air.

Chemical Stoichiometry

Chemical stoichiometry involves the quantitative relationships between reactants and products in a balanced chemical reaction. It allows the calculation of the amounts of substances consumed and produced, which is essential for determining how much CO2 can be removed based on the volume and concentration of the metal hydroxide solution.

Molarity and Concentration Calculations

Molarity, defined as moles of solute per liter of solution, is a key concept for quantifying the number of reactive species available in a solution. This concept is vital when converting the provided solution volumes and molarities into moles of hydroxide ions, and ultimately into the mass of CO2 that can be captured.

Metal Hydroxide Reactivity

Different metal hydroxides have distinct reactivities based on the number of hydroxide ions they furnish upon dissociation. The effectiveness of a metal hydroxide in capturing CO2 is influenced by its ability to provide the necessary hydroxide ions for neutralization, which affects the overall efficiency of the removal process.

Design Considerations for Closed Systems

When choosing a chemical scrubber for confined environments like a space capsule or submarine, factors such as reaction efficiency, safety, weight, and system complexity become critical. Selecting the appropriate hydroxide involves evaluating these factors to ensure optimal performance, ease of handling, and reliability in removing CO2 under different conditions.

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