Acid and alkali

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Across
  1. 4. what alcohol is a ph 4
  2. 5. what is one of the colours of litmus paper
  3. 6. what colour is a strong acid
  4. 7. what is used used in liquid acid and alkalis to see their pH
Down
  1. 1. what is a neutral solution
  2. 2. what can be used to test whether it is acid or alkaline
  3. 3. what is 7 and onwards on the pH scale
  4. 8. What is one of the colours of litmus paper