127. Solving a chemistry problem

127. Solving a chemistry problem

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

Additional information:

If the file does not open for you, install the Rar archiver program. Inside the archive, the solution is in WORD format.