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What is the hydroxide ion concentration of a solution of potassium hydroxide with a pH of 11? A - HSC - SSCE Chemistry - Question 6 - 2024 - Paper 1

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What is the hydroxide ion concentration of a solution of potassium hydroxide with a pH of 11? A. $10^{-11}$ mol L$^{-1}$ B. $10^{-3}$ mol L$^{-1}$ C. $10^{3}$ mol L$... show full transcript

Worked Solution & Example Answer:What is the hydroxide ion concentration of a solution of potassium hydroxide with a pH of 11? A - HSC - SSCE Chemistry - Question 6 - 2024 - Paper 1

Step 1

Calculate the hydroxide ion concentration from pH

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Answer

To find the hydroxide ion concentration, first calculate the pOH from the pH:

pOH=14−pH=14−11=3\text{pOH} = 14 - \text{pH} = 14 - 11 = 3

Next, use the formula for hydroxide ion concentration: [OH−]=10−pOH=10−3 mol L−1[OH^-] = 10^{-\text{pOH}} = 10^{-3} \text{ mol L}^{-1}

Step 2

Determine the correct answer choice

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Answer

The hydroxide ion concentration of the solution is therefore:

[OH−]=10−3 mol L−1[OH^-] = 10^{-3} \text{ mol L}^{-1}

The correct answer is B: 10−310^{-3} mol L−1^{-1}.

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