If a weak acid is added to a strong acid, does it make the solution more acidic or less acidic? Assuming that the weak acid is not one of those ions that can turn into a stronger acid or a stronger base (like H2CO3 <--> HCO3 <--> CO3). I was thinking something like adding ethanoic acid to hydrochloric acid. I'm not sure if it would make the solution stronger or weaker. I was thinking that maybe the strong acid would make the weak acid behave a little more like a strong base since weak acids are always weak bases. When weak bases are added to strong acids, they behave like strong bases (and vice versa). I just need the answer; no expanation is needed.