Acids and alkali

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Across
  1. 3. HCL + ? = a ph of 7 (used in a lot of experiments we have done)
  2. 4. a ph of 8 - 14
  3. 6. a substance to determine the ph of a liquid (it is two words but i had to join them together
  4. 7. an acid that comes from lemons
Down
  1. 1. A lung disease caused by breathing in volcanic ash (this is a bonus you don't have to do it)
  2. 2. a scale to show how acidic or alkaline a substance is
  3. 3. a way to bring the ph to 7
  4. 5. a ph of 1 - 6