Paul Morgan - A Level Chemistry Tutor

Paul Morgan - A Level Chemistry Tutor Online A Level Chemistry Tutor Helping students understand A Level Chemistry. I'm an ex Atomic Energy Authority Nuclear Waste Manager.

Have a masters degree in Radiation Chemistry and have research published in the Journal of Radiochemistry. I am a fully qualified and experienced teacher and tutor. I often say its a job I enjoy so much I'd do it for free... if only I had no bills to pay.

24/12/2025



15/12/2025

Answers......

0.01 mol of Barium Hydroxide will react with 0.02 mol of water

and produce 0.01 mol of Ba(OH)2 and 0.01 mol Hydrogen gas

Therefore the reaction produces

0.01 mol barium ions
O.02 mol hydroxide ions
0.01 mol hydrogen molecules

A Incorrect ❌

O.02 mol of hydroxide ions.
Number of ions = 0.02 x 6.02 x 10²³

B Correct ❌

V = n x 24 = 0.01 x 24 = 0.24 dm³

C Correct ✅

C = n ÷ V
= 0.01 mol ÷ 0.5 dm³
= 0.02 moldm–³

D Incorrect ❌

Reacts with 0.02 moles of water

15/12/2025

The two ions HBr will form are:

H+(aq) and Br-(aq)

A. Correct ✅

H+(aq) ions will react with carbonate ions to form carbon dioxide and water. So effervescence occurs due to carbon dioxide.

B. Incorrect ❌

Bromide ions will form AgBr a CREAM precipitate on addition of silver nitrates.

C Incorrect ❌

Bromide Ions will form AgBr a CREAM precipitate on addition of silver nitrate.

D. Incorrect ❌

No colour change and no precipitate formed. All the ions are aqueous.

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