Question

question ① the action of a buffer to maintain ph within normal limits involves ____________ answer removing or replacing sodium ions adding weak acids removing or replacing hydrogen ions replacing bicarbonate ions i dont know yet

Explanation:

Buffers work by neutralizing added acids or bases. They do this by removing or replacing hydrogen ions ($H^+$). When an acid is added, the buffer's conjugate - base component reacts with the $H^+$ ions, and when a base is added, the buffer's acid component donates $H^+$ ions. Sodium ions, weak acids addition, or replacing bicarbonate ions are not the primary mechanism for pH - maintenance by buffers.

Answer:

removing or replacing hydrogen ions