Step-by-step explanation:
We are given: concentration of a weak acid = 10^-4 M
Answer:
The pH of a weak acid is 4.
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![\begin{gathered} pH\text{ = -log\lbrack H}^+] \\ \\ \text{ = -log\lbrack10}^(-4)] \\ \\ \text{ = 4} \end{gathered}](https://img.qammunity.org/2023/formulas/chemistry/high-school/bovtpj4m935hrmwxjg1yq5mpasmibjnmg0.png)