Solutions, Acids and Alkalis

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Solutions, Acids and Alkalis
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What is a solute?
A substance which is dissolved to form a solution
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What do you call a substance which can be used to
dissolve something?
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A Solvent
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What term describes something which can be
dissolved?
Soluble
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What do you get when you mix a solute and a
solvent?
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A solution
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What is a saturated solution?
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A solution which cannot dissolve any more solute.
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What could you do to dissolve MORE solute in a
saturated solution?
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Heat it
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How would you use universal indicator or pH paper
to find the pH of a substance ?
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Add indicator/pH paper to the substance and the
compare the colour to the pH chart
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What is the range of pH values for an acid ?
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Less than 7
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Universal indicator was added to a solution and
it turned RED. What type of solution is it ?
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acidic
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What is the pH range for an ALKALI ?
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Greater than 7
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Universal indicator was added to a solution and
it turned blue. What type of solution is it?
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Alkaline
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What is the pH number for a neutral substance?
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7
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What is neutralisation?
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The reaction of an acid and an alkali to form a
neutral substance
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Universal indicator was added to a solution and
it turned green. What type of solution is it?
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neutral
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Give an example of a neutralisation reaction
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Indigestion powder (the powder neutralises the
excess acid in the stomach)
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What would you use to treat a wasp sting?
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Vinegar (the acidic vinegar neutralises the
alkaline wasp sting)
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Give an example of a common acid
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vinegar, fizzy drinks
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Give an example of a common alkali.
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Toothpaste, bicarbonate of soda
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What happens to the pH of an acid when diluted
with water?
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It increases to 7
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What happens to the pH of an ALKALI when diluted
with water ?
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It decreases to 7
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What happens to the acidity of an acid when
diluted with water ?
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The acidity decreases (less acidic)
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What happens to the alkalinityof an alkali when
diluted with water?
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It decreases -becomes less alkaline
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What would you use to treat a bee sting?
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Baking powder (the alkaline baking powder
neutralises the acidic bee sting)
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Complete the word equation
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Salt
Acid
Alkali


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Water
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Complete the word equation
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Hydrochloric Acid
Sodium hydroxide
Sodium chloride
Water

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Complete the word equation
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Hydrochloric Acid
Potassium chloride
Potassium hydroxide
Water

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