Acids, alkalis and indicators

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Across
  1. 2. What you see when acids dissolve metals
  2. 4. The name of an indicator which only turs red or blue
  3. 5. The colour of litmus in an acid
  4. 8. A substance with a pH of 7
  5. 9. The symbol of hydrochloric acid
  6. 11. The colour of litmus in an alkali
  7. 12. The symbol of sodium hydroxide
  8. 15. The checmial with the symbol NH3
  9. 17. The ion which makes a chemical an alkali
  10. 18. The name of an indicator which changes to the colours of the rainbow
  11. 19. The chemical with the symbol H2O
Down
  1. 1. The type of reaction when an acid and alkali react
  2. 3. The colour of universal in an alkali
  3. 6. The colour of universal in a weak scid
  4. 7. A substance with a pH above 7
  5. 9. The ion which makes a chemical an acid
  6. 10. The hazard associated with strong acids
  7. 13. The most common neutral substance
  8. 14. The colour of universal in a strong acid
  9. 16. The colour of universal in pure water
  10. 17. The symbole of sulfuric acid
  11. 20. A substance with a pH below 7