pH Scale Flashcards
Colour of a strong acid
Red/ orange
What is the colour of neutral on pH scale
7 green
acids (numbers on pH scale)
0-6
Alkalis numbers on pH scale
8-14
What are two ways you can measure the pH of a solution
pH meter and universal indicator paper
3 ways to measure the pH
pH meter, universal indicator or UI paper
What does the pH scale do
Measure of acidity of alkalinity of a solution
What is hydrochloric acid (formula)
HCl
What is sulphuric acid formula
H2SO4
What is the formula of carbonic acid
H2CO3
Do strong acids fully or partly dissociate
Fully
What is complete dissociation
Where a solution has none of the original molecules remaining after reacting
What is a base
A metal oxide or hydroxide that react with acids to produce salt and water
What salt does hydrochloric acid make
(Metal) chloride
What salt does sulphuric acid make
(Metal) sulphate
What salt does nitric acid form
(Metal) nitrate
hydrochloric, sulphuric and nitric acids are all examples of…
Strong acids
What is a salt?
An acid where the hydrogen has been removed and replaced with a metal
How do you write the name of a salt?
Metal + salt formed from acid
eg. magnesium chloride (hydrochloric acid + magnesium)
What does an acid + metal produce
salt + hydrogen
What does an acid + metal oxide produce
salt + water
What does an acid + metal carbonate produce
salt + carbon dioxide + water
What makes an acid strong
When it is fully ionised in an aqueous solution
small amount of solvent and lots of solute
concentrated or dilute?
Dilute
what is concentrated
little amount of solute and large volume of solvent (acid)
All acids are…? (State symbol)
(aq)
What is the copper (II) oxide formula
CuO
In the required practical what does filtering the solution do?
Removes unreacted CuO that was added after its maximum that could dissolve in the amount of acid.
