In this experiment you will determine the relative formula mass, Mr, of basic zinc carbonate, ZnCO3•2Zn(OH)2•xH2O, by an alternative method.
A known mass of basic zinc carbonate is reacted with a known volume and concentration of hydrochloric acid, HCl. The acid added is in excess. You will titrate portions of the resulting solution with sodium hydroxide, NaOH, of known concentration.
FA 2 has been prepared as follows:
3.52g of basic zinc carbonate, ZnCO3•2Zn(OH)2•xH2O, is reacted with 100 cm³ of 2.00 mol dm⁻³ hydrochloric acid, HCl. The resulting solution is diluted to 1.00 dm³ with distilled water.
FA 3 is 0.150 mol dm⁻³ sodium hydroxide, NaOH.
FA 4 is bromophenol blue indicator.

Q: What topic does this question test?

This question tests Analytical techniques in A-Level Chemistry (syllabus code 9701). It is worth 17 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Chemistry Feb/Mar 2023 examination, Paper 3 Variant 3 (9701_m23_qp_33.pdf).

Question

In this experiment you will determine the relative formula mass, Mr, of basic zinc carbonate, ZnCO3•2Zn(OH)2•xH2O, by an alternative method.
A known mass of basic zinc carbonate is reacted with a known volume and concentration of hydrochloric acid, HCl. The acid added is in excess. You will titrate portions of the resulting solution with sodium hydroxide, NaOH, of known concentration.
FA 2 has been prepared as follows:
3.52g of basic zinc carbonate, ZnCO3•2Zn(OH)2•xH2O, is reacted with 100 cm³ of 2.00 mol dm⁻³ hydrochloric acid, HCl. The resulting solution is diluted to 1.00 dm³ with distilled water.
FA 3 is 0.150 mol dm⁻³ sodium hydroxide, NaOH.
FA 4 is bromophenol blue indicator.

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