Final answer:
Jack and Emily should consult with their teacher on the proper disposal methods for the saltwater and soap and water solution from their science experiment, and adhere to laboratory safety protocols, including hand washing after handling and disposing of materials.
Step-by-step explanation:
Jack and Emily should follow proper disposal procedures for each solution they have used in their science experiment. According to safety guidelines, chemicals should not simply be poured down the sink or discarded in the trash bin without proper consideration. One of these solutions contains saltwater, and while saltwater is generally safe to pour down the sink, they should still confirm with their teacher. The other solution is a mixture of soap and water, which might also be safe for sink disposal, but again, following the teacher's instructions is essential. This ensures adherence to best practices in laboratory safety and environmental responsibility.
Since the question suggests an interest in the disposal, care should be taken to prevent accidents, and skin should be protected by hand washing post-disposal. They should speak to their teacher to understand the specific disposal protocols, especially if these protocols have been previously established for their laboratory exercises.