Each group needs:

Possible materials:

• potato slices (8 per group)
• 4 cups
• 4 concentrations of salt ( NaCl) dissolved in water: 100 ml of each per group

0 % - pure distilled water

5% - 5 g NaCl/ 100 g solution

10% - 10g NaCl/ 100 g solution

15% - 15g NaCl/100 g solution

• balances
• Keepers of the Gate Design Challenge Student Worksheet, one per student