Neutral solutions have pH = 7 at 298 K. A sample of pure water is found to have pH lt7. Does it mean thatit is acidic ? Explain.

Neutral solutions have pH = 7 at 298 K. A sample of pure water is foun

1.	Neutral solutions have pH = 7 at 298 K. A sample of pure water is found to have pH lt7. Does it mean thatit is acidic ? Explain.
Answer» Solution :`pH lt 7` for pure `H_(2)O` shows that water is at a temperature HIGHER than 298 K. It is neutral at all temperatures. At higher temperature, `H_(2)O` dissociates more to give larger CONCENTRATIONS of `H^(+)` ions and `OH^(-)` ions. HENCE, `pH lt 7`. HOWEVER, `[H^(+)]=[OH^(-)]` at all temperatures.