Carbon dioxide, at high concentrations, is toxic to the human body. In the Apollo moon missions, carbon dioxide scrubbers are used to maintain the level of carbon dioxide at a safe level in the space modules. The carbon dioxide scrubbers contain canisters of lithium hydroxide. Suggest an explanation how the carbon dioxide scrubber works and give a balanced equation (without state symbols and assuming that the relevant chemicals can react directly with each other) to support your answer.