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Across

2. an example of indiator

4. can act as base or acid

6. it is introduced in 1923

7. meaning of the word

8. Ka

9. it is introduced in 1923

10. relationship between the element lose H+ and the element gain H+

12. hypothesis

13. lose something

14. Kb

15. Distinguish acid or base

Down

1. Kw

3. divides things into groups

5. receive something

11. at the beginning

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