Answer:
To solve this, first, calculate the concentration of CH₃NH₂ after mixing using the initial concentration and volumes. Then, use an ICE table to find the concentration of CH₃NH₃⁺. Finally, use the Kb expression to find the concentration of OH⁻ ions and convert to pH. The concentration of CH₃NH₃⁺ will be equal to the concentration of OH⁻, as they react in a 1:1 ratio.
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