Which antacid tablet is most effective in neutralising acid in the stomach?
Effective?
Neutralisation reactions
Risk assesment
Antacid tablet
Antacids are a group of medicine that help neutralise the acids in the stomach.
Combination of compounds with various salts such as magnesium and aluminium.
Should have rapid effects.
Fine particle size.
Should have a long lasting effect.
Water insoluble
Some common antacid brands include Alka-Seltzer, Gaviscon, Mylanta, Rolaids and TUMS.
They have many uses such as: reducing symptoms of acid reflux which can cause heartburn, relieving ulcers and part of the gut called the duodenum.
A neutralisation reaction is when an acid and base react to form water and a salt, involving a combination of H+ and OH- ions to make water.
It results in the pH if the mixture moving towards level 7.
Antacids cause neutralisation reactions in the stomach because the chemicals in them are bases (alkali), as opposed to the acids in the stomach. This reaction makes the stomach's contents less corrosive.
Variables
Limitations
E.g. HCl + NaOH → NaCL + H₂O This is an example of a strong acid reacting with a strong base, creating a salt (neutral product) and water.
Key factors
pH of solution after mixed with Hydrochloric acid (HCl)
Time taken for antacid to neutralise acid to pH 7
Controlled variables
Independent variable
Dependent variable
Time taken to neutralise acid
Type of antacid used
Acid used (HCl)
Room temperature
They are either made from a carbonate or hydroxide.