Testing for ions Flashcards
Chemistry
What is the test for the presence of sodium ions?
A yellow flame test indicates the presence of sodium ions.
What color flame indicates the presence of potassium ions?
A lilac flame indicates the presence of potassium ions.
Which reagent is used to test for the presence of chloride ions?
Silver nitrate is used to test for chloride ions.
What is the expected result when testing for chloride ions with silver nitrate?
A white precipitate of silver chloride is formed.
What color precipitate indicates the presence of copper(II) ions in a sodium hydroxide test?
A blue precipitate indicates the presence of copper(II) ions.
What is the test for sulfate ions?
Barium chloride is used to test for sulfate ions.
What is the expected result when testing for sulfate ions with barium chloride?
A white precipitate of barium sulfate forms.
How can you test for the presence of carbonate ions?
Add dilute acid; effervescence indicates the presence of carbonate ions.
What gas is produced when carbonate ions react with dilute acid?
Carbon dioxide gas is produced.
What is the color of the precipitate formed when testing for iron(III) ions with sodium hydroxide?
A reddish-brown precipitate is formed.
What color precipitate indicates the presence of iron(II) ions in a sodium hydroxide test?
A green precipitate indicates the presence of iron(II) ions.
What test can be used to identify ammonium ions?
The addition of sodium hydroxide followed by heating releases ammonia gas.
What is the characteristic smell of ammonia gas?
Ammonia gas has a pungent, sharp smell.
What color flame indicates the presence of lithium ions?
A crimson flame indicates the presence of lithium ions.
What is the test for nitrate ions?
Add sodium hydroxide and aluminum foil, then heat; ammonia gas indicates nitrate ions.
What is the characteristic reaction of magnesium ions with sodium hydroxide?
A white precipitate of magnesium hydroxide is formed.
What is the result of adding dilute hydrochloric acid to a sample suspected of containing sulfite ions?
Bubbling occurs due to the release of sulfur dioxide gas.
What is the color of the precipitate formed when testing for lead(II) ions with potassium iodide?
A bright yellow precipitate of lead(II) iodide is formed.
