Chemistry

This is an acid–base neutralization problem where you need to find what remains after the reaction. Start by calculating moles of acid and base using $n = M \times V$, then determine which is in excess by comparing them. The key insight is that $\ce{H+}$ and $\ce{OH-}$ react in a 1:1 ratio, so whichever reactant doesn't fully neutralize the other will determine the final pH. Once you know what's left over, find its concentration in the total volume and convert to pH.

This is an acid–base neutralization problem where you need to find what remains after the reaction. Start by calculating moles of acid and base using $n = M \times V$, then determine which is in excess by comparing them. The key insight is that $\ce{H+}$ and $\ce{OH-}$ react in a 1:1 ratio, so whichever reactant doesn't fully neutralize the other will determine the final pH. Once you know what's left over, find its concentration in the total volume and convert to pH.