7E Acids and Alkalis
Curing indigestion
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Objective
• To explain which cure for indigestion works
the best and why
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What is indigestion?
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Possible cures
1
2
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3
What the cures claim?
• All three cures claim to be the best
• All three are alkalis
• Brioschi contains 10% sodium hydrogen
carbonate
• Rennie contains 30% sodium hydrogen
carbonate
• Pept-Eez contains 60% sodium hydrogen
carbonate
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College
Making Predictions
Level In my plan, I can .......
3
 make a simple prediction
4
 make a prediction
5
 make a prediction, using scientific knowledge
and understanding
6
 make a prediction, using simple models and
theories
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Method
1
2
3
– Add 10cm3 of acid to each of the test
tubes (CAREFUL)
– Add 3 drops of universal indicator
– Record the colour and pH of the
three solutions
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Obtaining Evidence
Level
3
4
5
In my experiment, I can .......
 use simple equipment to make measurements
e.g. length and mass
 make basic observations
 make enough measurements and/or
observations for the investigation
 make a series of measurements and/or
observations that are accurate
 spot that a result is “odd” and repeat the
experiment
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Was your prediction correct?
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Controlling Variables
Level In my plan, I can .......
3
 explain why a test is fair
4
 decide if a fair test is needed and describe
how to make the test fair
5
 say which are the key variables
6
 identify the most important key variables that
need to be controlled
Howden School and Technology
College