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Question 18M.3.sl.TZ1.14a.ii

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Date May 2018 Marks available [Maximum mark: 2] Reference code 18M.3.sl.TZ1.14a.ii
Level sl Paper 3 Time zone TZ1
Command term Determine Question number a.ii Adapted from N/A
a.ii.
[Maximum mark: 2]
18M.3.sl.TZ1.14a.ii

Excess stomach acid can be counteracted by a range of medications.

(a.ii)

Determine the amount, in mol, of hydrochloric acid neutralized by one antacid tablet.

[2]

Markscheme

n(HCl) = 2 n(CaCO3) + 2 n(MgCO3)

OR

n(HCl) =  2 × 0.680 ≪ g ≫ 100.09 ≪ g mo l − 1 ≫ + 2 × 0.080 ≪ g ≫ 84.32 ≪ g mo l − 1 ≫

 

«n(HCl) = 0.0136 mol + 0.0019 mol =» 0.016 «mol»

 

Award [2] for correct final answer.

Award [1 max] for correctly calculating amount of acid neutralized by just CaCO3 (0.014 «mol») or MgCO3 (0.002 «mol»).

[2 marks]

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