The standard calculation

2 marks · Hard

In a titration experiment, a student uses 15.0 cm³ of 0.150 mol/dm³ hydrochloric acid to neutralise a sodium carbonate solution. Calculate the number of moles of hydrochloric acid that were used. Give your answer to three significant figures.

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0.00225 mol (±0.00005)

Common mistakes: Not converting 15.0 cm³ to dm³; Incorrect multiplication or division

Show mark scheme and worked solution

Marking points

M1 · 1 mark · Correctly converts 15.0 cm³ to dm³ (0.0150 dm³) or applies correct formula for moles.

A1 · 1 mark · Accurately calculates 0.00225 mol.

Worked solution

First convert volume to dm³:

Calculate number of moles:

Final answer: 0.00225 mol