Inorganic Practical Flashcards
What reagents are used to test for sulfate ions
BaCl2
HCl
What is produced if sulfate is present
White precipitate
What is the simplest ionic equation for the test of sulfate
Ba2+ (aq) +SO42- —> BaSO4
Why is hydrochloric acid added to test for sulfate ions
Is used to react with the carbonate impurities
Prevent formation of barium carbonate
What reagents are used to identify halides
Nitric acid
Silver nitrate
What is produced if chloride is present
White precipitate
What is the ionic equation for when chloride is present
Ag+ +Cl- —> AgCl
What forms when bromide is present
Cream precipitate
What is the ionic equation for when bromide is present
Ag+ + Br- —> AgBr
What is the colour of precipitate when iodide is present
Yellow precipitate
What is the ionic equation for presence of iodide
Ag+ +I- —> AgI
What is the role of nitric acid when identifying halides
Reacts with any carbonates to prevent the formation of Ag2CO3
What is a reducing agent
Something that donates electrons
What is the trend for reducing ability in group 7
Reducing power increases down group 7
Why does reducing ability increase as you go down group 7
The ions get bigger it is easier for outer electrons to be given away
As attraction with nucleus gets smaller
What is the reaction when fluoride ions react with sulfuric acid
NaF +H2SO4 —> NaSO4 + HF
