Question: please show me how they got this answer What is the pH of 250 mL of water after mixing with 250 mL of 5 mM

please show me how they got this answer
please show me how they got this answer What is the pH

What is the pH of 250 mL of water after mixing with 250 mL of 5 mM HCl? a. 2.3 b 2.6 c. 7.0 d. 11.4 e. 11.7

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