Edexcel IAL Chemistry A2 Arithmetic and Weighted Means

Edexcel IAL Chemistry A2 Arithmetic and Weighted Means
Pearson Edexcel International Advanced Subsidiary/Advanced Level in Chemistry, Issue 1, September 2017Chemistry XCH11/YCH11

Practise Edexcel IAL Chemistry arithmetic and weighted means through titration tables, concordant titres, outlier choices and mean-volume calculations.

How this is tested

  • Select concordant titres within 0.2 cm3 and exclude rough or outlying titrations before averaging.
  • Complete burette-reading tables by subtracting initial from final volumes before calculating a mean titre.
  • Calculate arithmetic means from all valid results and report titre or volume values with suitable precision.

Question 19(b)(iii)

[Maximum number: 1]

Both butter and margarine are fats used in cooking.

Data for the bromination of 0.5 g samples of a margarine are shown.

Table for Question 19(b)(iii) — Edexcel A-Level Chemistry A2

Calculate the mean volume of bromine water using all results in the table.