Acids And Alkalines Flashcards
What is an acid?
A substance that dissolves in water to give a solution with less than a pH of 7
What is concentrated?
In a concentrated solution of an acid there is lots of the acid dissolved in a measured amount of water
What is dilute
Small amount of acid dissolved in a measured amount of water
Hydrochloric acid uses
Human stomach -digestion
Sulphuric acid use
Car batteries
Nitric acid uses
Fertilisers
Ethanoic acid
Substance in vinegar
Citric acid use
Oranges, lemons, citrus fruits
Carbonic acid use
Fizzy drinks
Indicator
Substance which is one colour in acidic solutions and another in alkaline
This can also be made of natural resources like red cabbage
Alkalai
Substance thT dissolve in water to give a solution with pH more than 7
Acid or alkaline?
Less than pH 7
Acid
Colour of litmus in acid and alkaline
Red and indigo blue
Phenolphthalein colours in both acid and alkaline
Colourless and in alkaline it goes magenta
Methyl orange in acid and alkaline
Orange / red and then yellow
Bromothymol blue colours
Orange / yellow in acid then in alkaline it’s blue
What is a pH scale
Number scale determining how acidic or alkaline a substance is 1-14
A pH less than 7 is?
Acidic
Over 7 pH is…?
Alkaline
7 pH
Neutral
Universal indicator
Mixture of indicators that shows how strongly acidic or alkaline a solution is
What is a base
An insoluble metal oxide or hydroxide
A base weakens an acid. True or false
False. It neutralises it
An alkaline is a soluble base
True or false
True
What is a reaction between an acid and a base called?
Neutralisation
What is an example of neutralisation?
Salt
What liquid do acids need to work easily?
Water
What do U use to neutralise bee stings
A base or alkaline
What do U use to neutralise wasp stings
Acidic
What do U use to neutralise nettle stings
Dock leaves or a base
Facts about soil
If soil is too alkaline or acidic the crops won’t grow properly
What pH is soil best used at?
6
