Why should distilled water be boiled and cooled when determining its pH?
An accurate determination of
When we measure
If we want accuracy in our measurement, we should use water that contains ONLY the ions that result from this equilibrium. Water from the tap would contain many ions that would slightly affect this equilibrium. We specify a given temperature because as written above this is a bond breaking reaction, i.e. an
Given all this at room temperature we find that under standard conditions that for pure distilled water