Talk about the theorem of making weak acid from strong acid. How did this theorem come about? number

Strong acid makes weak acid because weak acid has a strong ability to obtain protons (hydrogen ions), while strong acid has a strong ability to give protons. Weak acids are difficult to ionize after combining with protons.

Weak acid generates strong acid mostly because gas or other substances difficult to ionize are generated in the reaction products, and the strong acid is removed from the system, which leads to the positive ionization of weak acid and continues to give hydrogen ions until the reaction is completed.