Neutralisation starter

Define a Brønsted-Lowry acid

• A Brønsted-Lowry acid is a proton donor.
• A Brønsted-Lowry acid is a molecule that increases pH.
• A Brønsted-Lowry acid is a hydroxide donor.
• A Brønsted-Lowry acid is a proton acceptor.

Define a Brønsted-Lowry base

• A Brønsted-Lowry base is a substance that donates protons.
• A Brønsted-Lowry base is a substance that increases acidity.
• A Brønsted-Lowry base is a substance that accepts protons.
• A Brønsted-Lowry base is a substance that reacts with water to form hydroxide ions.

In the following acid-base reaction identify the reactant species (ion or molecule) acting as a Brønsted-Lowry base;

2 NH3 + H2SO4 → (NH4 + )2SO4 2-

• H2SO4
• NH3
• NH4+
• (NH4+)2SO4 2-

In the following acid-base reaction identify the reactant species (ion or molecule) acting as a Brønsted-Lowry base;

Ca(OH)2 + H2CO3 → CaCO3 + 2 H2O

• Ca(OH)2
• CaCO3
• H2O
• H2CO3

Calculate the pH (to 2 dp)

[H+ ] = 3.50 × 10–3 mol dm–3

• 2.46
• 1.50
• 4.00
• 3.00

Calculate the pH (to 2 dp)

0.004 mol dm–3 NaHSO4, Ka of HSO4 = 1.00 × 10–2 mol dm–3

• 1.70
• 1.50
• 2.00
• 1.90

Ethylamine is a weak base. Draw a curly arrow on the diagram below to show how the ethylamine acts as a base.