5. Calculate the pH of the following solutions:
1) The solution was prepared by diluting 20 ml of 49% nitric acid solution (density 1.304 g/cm3) with water to 500 ml.
2) Formic acid solution, 50 ml of which contains 2.30 g of HCOOH
3) The solution was obtained by mixing 80 ml of 0.2 N ammonia solution with 20 ml of 0.4 N hydrochloric acid solution.

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