Self-Ionisation of Water (HSC SSCE Chemistry): Quizzes

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Self-Ionisation of Water
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What is another term for the self-ionisation of water?

Autoionization

What does it mean that water is amphiprotic?

It can act as both an acid and a base

What is the value of KwK_w at 298 K?

1.0×10−141.0 \times 10^{-14} (mol L−1^{-1})2^2

What is [H3O+][\text{H}_3\text{O}^+] in pure water at 298 K?

1.0×10−71.0 \times 10^{-7} mol L−1^{-1}

Roughly how many water molecules are ionised at any given moment?

2 out of every billion

When is a solution classified as acidic at 298 K?

[H3O+]>[OH−][\text{H}_3\text{O}^+] > [\text{OH}^-]

Why must you consider temperature when using KwK_w?

KwK_w changes with temperature

What is the expression for the self-ionisation constant KwK_w?

Kw=[OH−][H3O+]K_w = [\text{OH}^-][\text{H}_3\text{O}^+]

If [OH−]=1.0×10−4[\text{OH}^-] = 1.0 \times 10^{-4} mol L−1^{-1}, what is [H3O+][\text{H}_3\text{O}^+] at 298 K?

1.0×10−101.0 \times 10^{-10} mol L−1^{-1}

For a strong base with one OH−\text{OH}^- group, what equals the base concentration?

[OH−][\text{OH}^-]

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Properties of Acids and Bases

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Properties of Acids and Bases

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Properties of Acids and Bases

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Quantitative Analysis

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Properties of Acids and Bases

Brønsted-Lowry Theory

Quantitative Analysis

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