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| 1. |
Neutral solutions have pH = 7 at 298 K. A sample of pure water is found to have pH `lt ` 7. Does it mean that it is acidic ? Explain. |
| Answer» `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. | |