61. Determine the active acidity (pH) of gastric juice in two patients using the following data. In the presence of an appropriate indicator, 2 ml of KOH solution with a titer of 0.14 mg/ml was used to titrate 10 ml of gastric juice of the first patient. In the case of the second patient, titration of 5 ml of gastric juice required 1 ml of a solution containing 0.56 g of KOH in 100 ml of solution.

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