Question

in a lab experiment, students were tasked to collect exactly 50 ml of saltwater from a nearby beach and take it back in the lab room. then, they are supposed to find out how much salt (in grams) they can recover from their saltwater sample. which of the following pieces of equipment will help do the lab properly, safely, and effectively? ( note: they may use equipment not found in the picture) ( 3 pts )
safety goggles, graduated cylinder, hot plate, iron ring, iron stand, wire gauze, mortar and pestle, watch glass, funnel, balance, beaker, crucible tongs, wash bottle
safety goggles, graduated cylinder, alcohol lamp, test tube, test tube, utility clamp, funnel, balance, wash bottle, filter paper
safety goggles, graduated cylinder, bunsen burner, iron ring, iron stand, wire gauze, evaporating dish, filter paper, funnel, balance, beaker, beaker tongs,
safety goggles, graduated cylinder, hot plate, test tube, test tube, utility clamp, ring, iron stand, wire gauze, funnel, balance, wash bottle

Explanation:

To determine the correct equipment for recovering salt from saltwater (a process involving evaporation and filtration steps), we analyze each option:

1. First Option: Includes mortar/pestle (for grinding, not needed here), watch glass (not key for salt recovery), and lacks filter paper/evaporating dish. Not suitable.
2. Second Option: Focuses on test tubes (for reactions, not recovery) and lacks evaporating dish/iron stand for heating. Not suitable.
3. Third Option: Contains:

• Safety goggles (for safety).
• Graduated cylinder (to measure 50 mL of saltwater).
• Bunsen burner, iron stand, wire gauze, evaporating dish (to heat and evaporate water).
• Filter paper, funnel (to filter any impurities, though evaporation is primary, but equipment supports both safety and recovery).
• Balance, beaker, tongs (to weigh the recovered salt and handle equipment).

This set covers measurement, heating/evaporation, filtration (if needed), and safety.

1. Fourth Option: Uses hot plate (less common for lab salt recovery) and lacks evaporating dish/filter paper, relying on test tubes (not ideal for large-scale evaporation).

Answer:

The third set of equipment (safety goggles, graduated cylinder, bunsen burner, iron ring, iron stand, wire gauze, evaporating dish, filter paper, funnel, balance, beaker, beaker tongs)