20.2 - The pH scale & strong acids Flashcards Preview

OCR A Chemistry A Level - Chapter 20 > 20.2 - The pH scale & strong acids > Flashcards

Flashcards in 20.2 - The pH scale & strong acids Deck (3)
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1

Who was the founder of pH and how does the pH scale work?

Soren Sorenson - uses [H+] to measure pH

[H+] range from 10-1 to 10-14, pH is on a scale form 1 to 14

 

2

How do you convert between [H+] and pH.

pH = -log[H+]

[H+] = 10-pH

  • a pH of 1 has 10 times as many H+ than a pH of 2
    • to dilute a solution from pH 1 to 4, dilution required is 1000 times. 

3

For mono-, di- basic acids, how does the acid conc. compare to [H+]?

For strong monobasic acids

[HA] = [H+]

For strong dibasic acids

2[HA] = [H+