Basics first! Part-3

Chemistry Level 1

What is p H + p O H pH+pOH of any solution equal to?

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Achal Jain by Achal Jain , 19, India

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2 solutions

Chirayu Bhardwaj
Jun 25, 2016

Relevant wiki:Acid and Bases

Ionic product of water
K w = 1 0 − 14 = [ H + ] [ O H − ] K_w=10^{-14}=[H^{+}][OH^{-}] Taking negative log on both sides
− l o g 1 0 − 14 = − l o g [ H + ] [ O H − ] ⟹ 14 l o g 10 = − l o g [ H + ] − l o g [ O H − ] -log10^{-14}=-log[H^{+}][OH^{-}] \implies14 log10=-log[H^{+}]-log[OH^{-}]
⟹ 14 = p H + p O H \implies \boxed {14=pH+pOH}

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the result is independent of temperature ?

Sabhrant Sachan - 4 years, 11 months ago

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No. The result is not independent of temperature. At higher temperatures the sum of pH and pOH decreases slightly.

Chirayu Bhardwaj - 4 years, 11 months ago

why decrease slightly??? @Sambhrant Sachan

Sazzad Hossain Rafi - 4 years, 11 months ago

pH+pOH=14 in 25°C in other temparture Kw was diferent

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