What is the pH of the mixed solution of 20mL 0.05M NaOH
30mL 0.02M H3PO4
20mL 0.02M HCl
30mL 0.02M NaCl?
Given that Pka1 of H3PO4 - 2.12
Pka2 - 7.2
Pka3 - 12.44
Please solve it step by step. I am struggling to understand how to solve it. Thank you!

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