I'm not completely sure what you are asking, but there appear to be two things here:Good afternoon All,
Like Lynn T I too have a brain drain.
I want to know how much 1M sodium hydroxide I need to add to a 100ml of 0.1M sodium hydroxide.
It took 17.5ml of 0.1M hydrochloric acid to neutralise 20ml of 0.1M sodium hydroxide.
I can't believe that I can't work this out!
In theory yes, if you were sure that the acid was exactly 0.1M so that it was definitely the hydroxide that was wrong (if 17.5ml 0.1M neutralises it then it would suggest the NaOH is 0.0875M) then you could add more 1M to the solution to bring it up to the right concentration.Thanks James, I have made up from fresh.
Can't I just add some 1M Sodium Hydroxide to the 0.1M Sodium hydroxide solution to make it equal strength to the 0.1M hydrochloric acid.
I make it 1.25ml of 1M sodium hydroxide to 100ml 0.1M Sodium hydroxide or dilute the hydrochloric acid?