Answer:
Explanation:
The older buildings posses the older pipes, when the pipes get older they get rusty as well as corroded. These pipes are likely to release copper and iron ions to the water supply of the old building. This imparts acidity to the water and hence, the pH is low. The newer buildings might have newer pipes, so the release of copper and iron will be in trace amounts or negligible in the water supply. Thus the acidity will be lower in water and also the pH will be normal.
