Introduction to Cation Analysis

Question 1

tends to look at types of molecules, functional groups, and chemical bonds

Answer 1

ORGANIC QA (iodine test)

Question 2

looks at the elemental and ionic composition of a sample, usually by examination of ions in aqueous solution

Answer 2

INORGANIC QA

• She used qualitative analysis to find that the solution contained Cu2+ and Cl- ions

Question 3

add a small amount of distilled water to the precipitate, stir the mixture to form a slurry, and quickly pour half of the slurry into another container

Answer 3

transferring a precipitate

Question 4

Adjusting pH

Answer 4

test the pH at appropriate intervals by touching the tip of the stirring rod to litmus or other pH indicating paper

Question 5

spatulas

Answer 5

Never place a metal spatula in a solution. It may dissolve and
cause contamination. If you need to manipulate a solid, use a
rubber policeman on a stirring rod.

Question 6

Qualitative analysis of cations usually consists of three stages

Answer 6

1. based on different solubility properties the cations are separated into 5 groups through the successive addition of selective precipitating reagents
2. within each group precipitated cations are separated through selective dissolution processes
3. the presence of each cation is verified through different identification tests