things we need to know for chemistry Flashcards
1
Q
what are metal hydroxide and oxides?
A
bases
2
Q
what does the salt produced depend on
A
the acid used
the metal in the base or alkali
3
Q
what are soluble hydroxides called
A
alkalis
4
Q
what can soluble salts be made with?
A
acid by reacting them with
- metals - not all suitable some are too reactive
- insoluble bases - base is added until no more will react and then the excess solid is filtered off
- alkalis - an indicator can be used, then repeat the experiment
5
Q
how can insoluble salts be made?
A
mixing apporpiate solutionsof ions so that a precipitate is formed, precipitation can remove unwanted ions from solutions,
6
Q
what does ammonia do?
A
dissolves in water to produce an alkaline solution, it produces ammonium salts which are important fertilisers
7
Q
what is a Ph scale?
A
a measure of the acidity or alkalinity of a solution
