materials:
1. red litmus paper
2. blue limus paper
3. sodium hydeoxide
4. hydeoxide acid
5. pipette
6. 4 test tubes
steps:
1. rip both litmus paper and put all 4 in the 4 test tubes
2.add 3 drops of hydeoxide acid in the 2 of the test tubes (the blue paper)
3.add 3 drop of sodium hydeoxide to the other 2 test tubes (the red paper)
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