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Date May 2011 Marks available 1 Reference code 11M.1.sl.TZ1.2
Level SL Paper 1 Time zone TZ1
Command term Determine and Solve Question number 2 Adapted from N/A

Question

1.7 g of NaNO3(Mr=85) is dissolved in water to prepare 0.20 dm3 of solution. What is the concentration of the resulting solution in moldm3?

A.     0.01

B.     0.1

C.     0.2

D.     1.0

Markscheme

B

Examiners report

Some respondents stated that the numbers could have been more user-friendly in these questions, as candidates do not have access to a calculator in P1. This is a fair comment which will be borne in mind for future paper-setting. Candidates found Q3 particularly challenging with only 35.79% of candidates getting the correct answer A. The inconsistent use of significant figures in Q2 was also commented on, equally a valid comment. One respondent stated that they found the use of dm3 instead of L confusing for North American candidates. However on IB Chemistry papers the unit of dm3 for volume is always used instead of L and candidates should be prepared for this.

Syllabus sections

Core » Topic 1: Stoichiometric relationships » 1.3 Reacting masses and volumes
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