Defining and Calculating pOH (HSC SSCE Chemistry): Flashcards

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Defining and Calculating pOH
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What pOH measures

Hydroxide ion concentration

pOH formula from [OH−][\text{OH}^-]

pOH=−log⁡10[OH−]\text{pOH} = -\log_{10}[\text{OH}^-]

[OH−][\text{OH}^-] formula from pOH

[OH−]=10−pOH[\text{OH}^-] = 10^{-\text{pOH}}

pH and pOH relationship at 25°C

pH+pOH=14\text{pH} + \text{pOH} = 14

KwK_w value at 298 K

1.0×10−141.0 \times 10^{-14}

[NaOH][\text{NaOH}] to [OH−][\text{OH}^-] ratio

1:1 or [NaOH]=[OH−][\text{NaOH}] = [\text{OH}^-]

[Ba(OH)2][\text{Ba(OH)}_2] to [OH−][\text{OH}^-] ratio

1:2 or [Ba(OH)2]=12[OH−][\text{Ba(OH)}_2] = \frac{1}{2}[\text{OH}^-]

pH/pOH change for 10× concentration change

1 unit

pH/pOH change for 100× concentration change

2 units

Temperature for pH + pOH = 14

25°C or 298 K

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