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Standard X

Chemistry

Acids and Bases in Water

What is the c...

Question

What is the concentration of an aqueous solution (containing hydroxide ion) with pH $5$ at $25^{0}$ C?

1 \times 10^{- 9}

molar

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1 \times 10^{- 11}

molar

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1 \times 10^{- 7}

molar

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1 \times 10^{- 3}

molar

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1 \times 10^{- 5}

molar

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Solution

The correct option is B $1 \times 10^{- 9}$ molar
The concentration of an aqueous solution (containing hydroxide ion) with pH 5 at 25 deg C is $1 \times 10^{- 9} M$

$p O H = 14 - p H = 14 - 5 = 9 [O H^{-}] = 10^{- p O H} = 10^{- 9} M$
The concentration of the solution is equal to the hydroxide ion concentration.

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What is the concentration of an aqueous solution (containing hydroxide ion) with pH 5 at 250 C?

The correct option is B 1×10−9 molarThe concentration of an aqueous solution (containing hydroxide ion) with pH 5 at 25 deg C is 1×10−9M pOH=14−pH=14−5=9[OH−]=10−pOH=10−9MThe concentration of the solution is equal to the hydroxide ion concentration.

What is the concentration of an aqueous solution (containing hydroxide ion) with pH $5$ at $25^{0}$ C?