Virtual CrezLab - Qualitative Analysis - The Laboratory Challenge

PERFORMANCE LABORATORY

The Laboratory Challenge

Lab Challenge 3

Modified GCE `O' Level Chemistry Practical

Observe the following demo experiment on solid R and solutions S and T, all of which contain the same transition metal. Record your observations in the table given. You should identify and name any gas evolved.

Solid R

Solution S

Solution T

Test	Play Movie	Observations
1) Add a portion of aqueous hydrogen peroxide to a small sample of R.	View experiment 1a View experiment 1b	1) Ask the expert
2) Add 1-2 cm3 of concentrated hydrochloric acid to a sample of R and warm gently.	View experiment	2) Ask the expert
3a) To a portion of solution S, add aqueous sodium hydroxide until a change is seen 3b) Add excess aqueous sodium hydroxide to the mixture from (a) and allow to stand for a few minutes.	View experiment	3a) Ask the expert 3b) Ask the expert
4a) To a portion of S, add an equal volume of aqueous barium nitrate. b) Add dilute nitric acid to the mixture from (a)	View experiment	4a) Ask the expert 4b) Ask the expert
5) To a portion of S, add an equal volume of aqueous sodium chlorate(I). Warm the mixture from (a) gently.	View experiment 5a View experiment 5b	5) Ask the expert
6) To a portion of T, add an equal volume of dilute sulphuric acid followed by aqueous hydrogen peroxide.	View experiment 6a View experiment 6b	6) Ask the expert
7) To a portion of T, add an equal volume of solution S.	View experiment	7) Ask the expert

Conclusions

In Test 1, solid R is acting as

In Test 2, solid R is acting as

The anion present in solution S is

In Test 6, solution T is acting as

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