Qualitative Analysis Flashcards
Name a benefit of using chlorine in water treatment
Kills bacteria
What type of ions do halogens form?
1- halides
What is the outer shell electron configuration of the halogens?
s2 p5
What are the colours of Cl2, Br2 and I2 solutions in organic solvents?
Pale green, orange, violet
How does the pH of a group 2 hydroxide solution change down the group?
Increases - more alkaline
What is formed from barium reacting with nitric acid?
Barium nitrate - Na(NO3)2
What is formed from magnesium reacting with oxygen?
Magnesium Oxide (MgO)
What is formed from strontium reacting with water?
Strontium hydroxide - Sr(OH)2
Define disproportionation
When an element is both reduced and oxidised at the same time
What is the correct sequence of tests for halides, carbonates and sulphates?
Carbonate test with acid then sulfate test with barium ions then halide tests.
Identify the test for halide ions and colours of precipitates
Add silver nitrate; Cl is white, Br is cream, I is yellow
What is the trend in reactivity down group 2?
Increases down the group
What is the outer shell electron configuration of Group 2 metals?
s2
What are the products when chlorine reacts with water?
HClO and HCl
When group 2 oxides react with water what type of compound forms?
The hydroxide eg calcium hydroxide