1) We add 1mL detergent of pH value 12 to 99mL water. The pH value will change to 8.5. ----solution A

2) We add 1mL detergent of pH value 12 to 999mL water. The pH value will change to 8. ----solution B

3) We add 1mL detergent of pH value 12 to 1999mL water. The pH value will change to 7.5. ----solution C

4) We add 1mL of vinegar to 199mL water. The pH value will change to about 6-7. ----solution D

5) We add 1mL of vinegar to 99mL water. The pH value will change to about 6-7. ----solution E

6) We add 1mL of vinegar to 49mL water. The pH value will change to about 6-7. ----solution F

7) We prepare a cup of water of water of 200mL. ----water

8) Then we put 7 fish in these different cups.
<The detergent <The Vinegar