What are pH values of distilled water and common salt solution ?

The pH value of pure water is 7. Compare the pH values of sulphur dioxide solution and ammonia solution with that of pure water.

40 mg of pure NaOH is dissolved in 10 litres of distilled water. The pH of the solution is

what is the pH value of solution?

What is the pH value for water ?

What is meant by pH value of a solution ? What is pH of neutral solution ?