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1999645
Acids & Alkalis
Descrição
A mind map about acids, alkalis and bases, the pH scale and universal indicator. Includes equations for neutralisation.
Sem etiquetas
acids
alkalis
reaction
ph
chemistry
acids & alkalis
gcse
Mapa Mental por
Tom Johnson
, atualizado more than 1 year ago
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Criado por
Tom Johnson
aproximadamente 9 anos atrás
537
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Resumo de Recurso
Acids & Alkalis
The pH Scale
Used to measure how acidic or alkaline a solution is
The strongest acid has a pH of 0
The strongest alkali has a pH of 14
A neutral substance (eg. water) has a pH of 7
Indicator Dye
The dye in an indicator solution changes colour depending on whether it's above or below a certain pH.
Universal Indicator is a combination of dyes that produce the colours in the diagram to the right depending on the pH of a solution
It's very useful for estimating the pH of a solution
Acids & Bases
Acids & Bases neutralise each other
An ACID is a substance with a pH of LESS than 7
Acids for H+ ions in water
A BASE is a substance with a pH GREATER than 7
An ALKALI is a base that DISSOLVES in water
Alkalis form OH- ions in water
H+ ions make solutions acidic
OH- ions make solutions alkaline
The reaction between acids and bases is called neutralisation
acid + base -> salt + water
H+ + OH- -> H2O
H2O (Water) has a neutral pH so this shows that an acid and bases neutralise each other
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