title: investigating neutralisation€¦ · substance that neutralises an acid is a base, and...
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![Page 1: Title: Investigating neutralisation€¦ · substance that neutralises an acid is a base, and alkalis are soluble bases). Examples of these bases are calcium carbonate, magnesium](https://reader035.vdocuments.us/reader035/viewer/2022063008/5fbdbdbaec31b976975260ee/html5/thumbnails/1.jpg)
Enter the room in silence. Put your planner, pencil case, exercise book and any other equipment you will need on your desk. Place your bags in the cupboards.
Title: Investigating neutralisation
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Enter the room in silence. Put your planner, pencil case, exercise book and any other equipment you will need on your desk. Place your bags in the cupboards.
Title: Investigating neutralisation
![Page 3: Title: Investigating neutralisation€¦ · substance that neutralises an acid is a base, and alkalis are soluble bases). Examples of these bases are calcium carbonate, magnesium](https://reader035.vdocuments.us/reader035/viewer/2022063008/5fbdbdbaec31b976975260ee/html5/thumbnails/3.jpg)
Design an investigation to compare the effectiveness of indigestion remedies.
Analyse data to identify a suitable indigestion remedy and suggest improvements to the investigation.
antacid
base
variable
correlation
repeatable
mean
Prior knowledge:
Acids AlkalisNeutralisation
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Heartburn indigestion is caused by acid from the stomach irritating the upper digestive tract.
For those who suffer regularly, treatments are available to neutralise this acid.
https://www.youtube.com/watch?v=7VzbRjU8F_c
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The human stomach contains strong hydrochloric acid, with a pH of approximately 1.
The acid helps enzymes to digest proteins in the stomach and also prevents some bacteria from surviving in the stomach.
Heartburn is a type of indigestion caused when the muscle leading from the oesophagus to the stomach opens, allowing stomach acid to move up the digestive tract.
The acid causes a burning sensation in the chest.
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Medicines called antacids contain substances that can neutralise the acid from the stomach.
These substances are bases (remember any substance that neutralises an acid is a base, and alkalis are soluble bases).
Examples of these bases are calcium carbonate, magnesium hydroxide and sodium hydrogencarbonate (baking soda).
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1. Heartburn is a burning sensation in the chest and throat; caused by
stomach acid moving up the oesophagus.
2. An alkali (or base) neutralises the stomach acid; making the solution less
acidic.
3. Increases the pH.
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When we plan an investigation, we must consider variables.
Things we could change are called independent variables. Altering these could make a difference to other things, which are called dependent variables. (the variable we measure)
Some of the independent variables will be kept the same; these are then called control variables.
If we alter one independent variable and see how a dependent variable changes we can look for a correlation.
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In this investigation, the students are changing the type of indigestion remedy. They are going to measure the time taken for the pH to change from 1 to 7.
4. Independent variable: type of indigestion remedy/antacid; dependent variable: time taken.
5. Starting pH, volume of acid solution, temperature of acid solution/ room.
6. How does the type of indigestion remedy affect the time taken for acid to be neutralised?
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If the repeat readings are close together, that suggests that our experiment is repeatable.
If this is the case, we can calculate a mean value from our data. If our repeat readings are not close together, we can choose to ignore a reading when calculating a mean or we could repeat that part of the investigation.
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The mean result is found by adding all the results together and dividing by the number of results
21 , 20, 55, 25, 32, 18, 62, 50
Calculate the mean of this data:
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7. The experiment is repeatable because you can take repeat readings close together.
8. 374 s, 183 s, 550 s.
B) Acid-ease is the most effective because it increases pH from 1 to 6 in the smallest time, with an explanation
of significance of increasing pH.
9. Use more accurate measuring equipment (e.g. measuring to one/two decimal points); repeat and calculate the
mean.
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Complete worksheet 1.6.9