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Which antacid tablet is most effective at neutralising acid in the…
Which antacid tablet is most effective at neutralising acid in the stomach?
Variables
independent
type of antacid
concentration of antacid
type of base
concentration of base
dependent
effectiveness of the base at neutralising acid
if salt and water is formed
if neutral pH of 7 is reached
time taken for acid to neutralise
controlled
environment
time of day
materials used
amount of each substance
uncontrolled
Weather
Humidity
Limitations
lack of access to highly concentrated acids, - doesn't replicate stomach acids
Impossible to replicate the exact conditions within the stomach in a laboratory setting
Cannot ethically test on a human
Factors affecting acid neutralisation
Temperature
Concentration
of acid
of base
pH level
of acid
of base
Other substances
Compatability of acid and base
Risk assesment
Acid related injuries (acid burn, ingestion, chemical burns etc)
Glass related injury (cuts, scrapes, impales etc)
Precautions
Using PPE such as gloves, masks, eye protection and aprons.
Keep harmful substances away from mouth, nose and eyes
Practice good judgement and care
Safe disposal of chemicals
In a school - chemicals can be handed up to the supervisor where they will dispose of them
Dangerous chemicals can be dropped off at depots around the city, or at a local rubbish tip
The product of the acid neutralisation will need to be disposed of safely and correctly
Antacids
A medicine that neutralises the acid in the stomach
usually used to relieve heartburn or indigestion
Most antacids contain one base: calcium carbonate, magnesium hydroxide, aluminum hydroxide or sodium bicarbonate.
Acids and bases are on opposite ends of the pH scale, so, when combined they create a neutral substance. Heart burn and indigestion can come from high levels of acidity in the stomach. Consuming an antacid (a base) will react with the acids in the stomach and create a fairly neutral liquid, relieving an individual of their ailment.
The acid within the stomach is hydrochloric acid (HCL)
Neutralising
forms salt and water
The hydrogen proton from the acid (H+) reacts with the hydroxide in the base (OH–), to create water (H20). The extra elements create a salt such as ammonium chloride or sodium nitrate.
acids can be hazardous, so neutralising can be necessary to uphold safety precautions.
effectiveness
ability to neutralise the acid
adjacency to true neutral (pH 7)
speed of neutralisation