What colour is a acid? What colour is a neutral solution?
Acid-Red Neutral-Green
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What is the most accurate way to measure pH? Why?
A pH probe. This gives a numerical value for the pH, so there is no opportunity for human error. (if you use universal indicator the colour can be read wrong)
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What is an acid?
A substance that forms aqueous solutions with a pH of less than 7
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What ions do acids form in water?
H+ ions
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What is a base?
A substance with a pH greater than 7
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What is an alkali?
A base that dissolves in water to form a solution with a pH greater than 7
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What ions do alkalis form in water?
OH- ions
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What is the general equation for neutralisation?
Acid + Base - Salt + Water
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What is the equation for neutralisation in terms of H+ and OH- ions?
H+ +OH- - H20
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What do titrations allow you to do?
To find out exactly how much acid is needed to neutralise a quantity of alkali. You can use this to work out the concentration of the acid or alkali.
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How do you increase the accuracy of your titration?
You need several consistent readings
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What indicator is used in a titration between an acid and an alkali?
Phenolphtga
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Other cards in this set
Card 2
Front
Is a solution with a pH of 14 acid or alkali?
Back
Alkali
Card 3
Front
What colour is a acid? What colour is a neutral solution?
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