pH of Strong Bases (OCR A-Level Chemistry A): Quizzes

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pH of Strong Bases
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What is the value of KwK_w at 25°C?

1.00×10−141.00 \times 10^{-14} mol² dm⁻⁶

Why does pure water have a pH of 7 at 25°C?

[\ceH+]=[\ceOH−]=1.00×10−7[\ce{H+}]=[\ce{OH-}]=1.00\times10^{-7}

What is the relationship between pH and pOH at 25°C?

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

If [\ceCa(OH)2]=0.050[\ce{Ca(OH)2}] = 0.050 M, what is [\ceOH−][\ce{OH-}]?

0.1000.100 mol dm⁻³

What does KwK_w represent?

The ionic product of water

If [\ceH+]=2.00×10−13[\ce{H+}] = 2.00 \times 10^{-13} M, what is [\ceOH−][\ce{OH-}]?

5.00×10−25.00 \times 10^{-2} mol dm⁻³

Which statement describes an alkaline solution?

[\ceH+]<[\ceOH−][\ce{H+}] < [\ce{OH-}]

What is the key property of strong bases?

They completely dissociate in solution

What is the pH of 0.0500 M NaOH at 25°C?

12.70

Why does KwK_w vary with temperature?

It is an equilibrium constant

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