When is the Ionic Product of Water Constant?

[TT0]

Homework Statement

Under which set of conditions is the ionic product of water, Kw, constant at a given temperature in aqueous systems?

1. in dilute acidic but not dilute alkaline solutions.
2. in dilute alkaline but not dilute acidic solutions.
3. in both dilute acidic and alkaline solutions.
4. only at the equivalence point of a strong acid-strong alkali titration.
5. only in pure water.

Homework Equations

The Attempt at a Solution

I don't understand what this question is asking. Is it asking in which scenario is the Kw constant for all temperatures or does it never change? Both of these I don't understand, could someone explain this to me?

Cheers!

 

[Borek]

Technically there is no correct answer between those given. Kw is constant always.

 

[TT0]

I see, so its just a bad question then?

Thanks

 

[Borek]

That's my opinion.