127. Задачка по химии №012 7245

49. Calculate the pH of the solution obtained by mixing:
1) 50 ml 0.1 M KH2PO4 and 25 ml 0.2 M KH2PO4
2) 30 ml 0.1 M Na2CO3 and 15 ml 0.1 NaHCO3

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