Question about diluting acidic solution.

[Minimalist]

Not sure if this is on the course, but if you have 10mL 6pH solution if HCl and and dilute it to 1000mL, what is the new pH? Thanks

[dfgjgddjidfg]

approximately 8

[Shenz0r]

You diluted it by a factor of 100, so you move two units up, giving a new pH of 8. This only works for strong acids though.

[Minimalist]

But 8 implies it's basic... surely that's not possible??

[emiinaaa]

Because the HCl is present in the solution at such a low concentration (10^-6), the main reaction occuring in that beaker or whatever is the self ionisation of water rather than the HCl + H₂O --> H₃O⁺ + OH^- reaction, making it essentially neutral, ie. pH close to 7.
I may be wrong, but this is how a similiar question that I've done was approached.

[kenhung123]

But 8 implies it's basic... surely that's not possible??

Remember the definition of an acidic and basic solution is based on the relative amounts of protons in relation to the hydroxides

[sin0001]

pH will approach 7, but won't pass it imo