Acids, Bases And Salts Flashcards
What colours do litmus solution go in acid, neutral and alkaline?
Acid: pale red
Neutral: purple
Alkaline: blue
What colours does red litmus paper go in acid, neutral and alkaline?
Acid: red
Neutral: stays red
Alkaline: blue
What colours does blue litmus paper go in acid, neutral and alkaline?
Acid: red
Neutral: stays blue
Alkaline: blue
What colours does phenolphthalein go in acid, neutral and alkaline?
Acid: clear
Neutral: stays clear
Alkaline: pink
What colours does methyl orange go in acid, neutral and alkaline?
Acid: red
Neutral: orange
Alkaline: yellow
What colours does universal indicator go in acid, neutral and alkaline?
Acid: red
Neutral: green
Alkaline: purple
What causes acidity?
The H+ ion
What does the pH scake measure?
Concentration of H+ ions
Is a logarithmic scale, like richter scale, so pH 1 contains 10x more H+ ions than pH 2, and 100x more than a pH of 3
What is a more accurate measure of finding out pH?
A pH meter
Define an arrhenius acid
An acid that dissolves into water to form hydrogen ions
What is the difference between calling an acid concentrated/dilute and calling an acid strong/weak
A concentrated acid is where there is lots of acid molecules dissolved into water
BUT
A strong acid is where lots of acid molecules have been split up into ions.
What is it called when an acid dissolves into water and splits up into H+ and another ion?
Disassociation, or ionisation
What does the reversible arrow show?
Reaction does not go to completion, only some molecules ionise
Acids are weak if…..?
Few molecules ionise/dissociate
Define bases
A substance that can neutralise acids
