Dilutions from a dissolved crystal

The first thing we did was we placed six test tubes in a test tube rack. Label the rack with numbers. Using a measuring cylinder fill test tube 1 with 10 mL of water. Fill the remaining test tube with 5mL of water. Using your tweezers, add a single crystal of potassium permanganate to test tube 1. gently shake the test tube until the crystal dissolved. Using the transfer pipette, carefully remove exactly 5mL from test tube 1 and pour it into test tube 2. Rinse the transfer pipette thoroughly to ensure that no purple solution remain. Gently shake test tube 2 and repeat the transfer process, transferring exactly 5mL of solution from test tube 2 to test tube 3. Rinse the pipette again and repeat the transfer process for test tubes 4, 5 and 6.

Test tub 1 was the most concentrated solution because it contains the largest amount of solute.  Number 6 was the diluted one because it had contained the smallest amount of solute than other test tubes.