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Across 1. A body fluid with a pH of 7.4. 3. Colour litmus is in an acidic substance. 4. A dangerous low or high pH substance. 6. A paper we use to test pH. 8. A low pH substance. 9. A cooking substance with a pH of around 2. 10. Another word for basic. 12. A type of flower which changes colour according the pH of the soil the plant is growing in. 14. Colour litmus is in an alkaline substance. 16. A dye we use to measure pH. 18. A substance with a neutral pH. 19. The pH of a neutral substance.

Down 1. Another word for alkaline. 2. Something you use to make things change colour. 5. A cleaning substance with a pH of approximately 11. 7. A cooking substance with a pH of approximately 9.5 11. The scale used to measure acidity. 13. The scale we use for indicators. 15. Seawater has a pH of around this number. 17. A food with a pH of around 5