if the pH is 9, what is the concentration of hydroxide ion? a) 10^-5 b) 10^-9 c) 10^3 d) 10^-14?

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if the pH is 9, what is the concentration of hydroxide ion? a) 10^-5 b) 10^-9 c) 10^3 d) 10^-14?

2007-06-12 09:43:17 · 2 answers · asked by deneshia t 1 in Science & Mathematics ➔ Chemistry

2 answers

Remember that pH + pOH = 14

Also remember that pX = -log[X]

So, if pH = 9, then :

pOH = 14 - pH = 14 - 9 = 5

If pOH = 5 = -log[OH], then [OH] = 10^-5

2007-06-12 10:08:43 · answer #1 · answered by Dave_Stark 7 · 1⤊ 0⤋

A - 10^5

The concentration of hydrogen ions would be 10^9, leaving 10^5 to make up the difference.

2007-06-12 16:59:10 · answer #2 · answered by yankee_fan907 2 · 0⤊ 1⤋