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  • 8 May 2024
    SunKyung Lee
    pH scale
    Thanks! 
  • 7 May 2024
    Geoffrey Neuss
    How 'International' is IB Chemistry?
    Hi William, Thank you so much for the positive feedback - I appreciate it, especially as I wrote the article as a blog in 2010 just before this website went live in January 2011.  One of the twenty NIS schools in Kazakhstan I helped to...
  • 7 May 2024
    William Macleod
    How 'International' is IB Chemistry?
    Enjoyed reading this article, thanks. 
  • 7 May 2024
    Geoffrey Neuss
    pH scale
    Hello SunKyung, At 25 oC, [H+(aq)] from water = 1.00 x 10-7 mol dm-3 so 1.00 x 10-9 mol dm-3 HCl(aq) will have virtually no effect on the concentration of H+(aq) in the aqueous solution so pH = very slightly less than 7.