The PH Scale And Salts Flashcards
When substances dissolve in water they______
Disassociate into the individual ions
Hydroxide ions make solutions_____
Alkaline
Hydrogen ions make solutions
Acidic
What is the pH scale
A measure of the acidity or alkalinity of an aqueous solution
How can the pH of a solution be measured
A ph probe or a universal indicator
What are indicators
Dyes that change colour depending on whether they are in acidic or alkaline solutions
What does litmus paper do
Changes the colour from red to blue or vice versa
What does a universal indicator do
It is a mixture of dyes that show a range of colours to indicate how acidic or alkaline a substance is
What are soluble bases called
Alkalis
What are acids neutralised by
Bases
What happened to acid reacts with an alkali
The H+ and OH- minus ions react together to produce water H2O which has a pH of 7
What exactly happens in a neutralisation reaction?
An acid is neutralised by an alkali and the solution that remains has a neutral PH of 7
What can acid be neutralised by except for alkalis
Metal oxides and metal carbonates
When is a salt produced
When the hydrogen in the acid is replaced by a metal ion
The name of the salt produced depends on what?
The acid used
