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Which antacid tablet is the most effective in neutralising stomach acid? -…
Which antacid tablet is the most effective in neutralising stomach acid?
Factors
what chemical compounds: different chemical compounds use up different amounts of HCl which shows their effectiveness.
variables
independent variable
Al(OH)3
Mg(OH)2
NaHCO3
CaCO3
dependent: pH level
what form the tablet is in
variables
independent variable
solid
liquid
dependent: pH
antacid concentration: some antacid tablets need to be taken in larger doses depending on their effectiveness.
in different beakers, test the pH of the solution each with different concentrations.
variables
independent variable
amount of antacid in the HCl
dependent variable: pH of the solution
test which antacid tablet needs the least concentration to neutralise the acid
variables
independent: antacid
dependent: concentration of antacid
length of time taken to neutralise: different chemical compounds take different amounts of time to react with the HCl
time the length of time that each different antacid tablet takes to neutralise the acid.
variables
independent: antacid
dependent: length of time
Background information
What is an antacid?
An antacid is a substance that neutralises an acid (a base)
antacid tablets neutralise stomach acid to relieve heartburn and indigestion
What is the chemical composition?
usually contain calcium, aluminium or magnesium
metal hydroxide, oxide, carbonate
Examples
Calcium carbonate CaCO3
Magnesium hydroxide Mg(OH)2
Aluminium hydroxide Al(OH)3
sodium bicarbonate NaHCO3
How do you measure effectiveness?
Measure amount of acid that has been neutralised
Back titration
measure pH
universal indicator
red cabbage water
red onion water
turmeric water
phenopthalein
bromothymol
red litmus
blue litmus
length of time taken to neutralise
concentration needed to neutralise
What is stomach acid made of?
HCl (hydrochloric acid)
links
https://www.webassign.net/labsgraceperiod/ucscgencheml1/lab_4/manual.html
https://www.nhs.uk/conditions/antacids/
https://www.ncbi.nlm.nih.gov/books/NBK526049/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6928904/
https://docs.google.com/presentation/d/1RaOMI3AOh2-VW9I_1wR7Z74sKJNHMu9oMiLTAdUZ8aI/edit#slide=id.g223bbe19353_0_12
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwjf8q7A74f_AhWBwTgGHSVPDfgQFnoECAgQAw&url=https%3A%2F%2Fwww.purdue.edu%2Fscience%2Fscience-express%2Flabs%2Flabs%2FEFFECTIVENESS%2520OF%2520AN%2520ANTACID%2520PURDUE%2520UNIVERISTY%2520INSTRUMENT%2520VAN%2520PROJECT%2520Determining%2520the%2520Effectiveness%2520of%2520an%2520Antacid%2520Using%2520a%2520pH%2520Mete1.doc&usg=AOvVaw15thn8RqyN9--c76DMFnmk
https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&cad=rja&uact=8&ved=2ahUKEwi1xLCW84f_AhXJplYBHZlaAZIQFnoECBgQAw&url=https%3A%2F%2Fwww.ncbi.nlm.nih.gov%2Fpmc%2Farticles%2FPMC8966100%2F&usg=AOvVaw2xWrNesAihC_GW5FxYT1Z1
https://www.google.com.au/books/edition/100_Questions_Answers_About_Gastroesopha/v_auBjXIccIC?hl=en&gbpv=1&dq=what+makes+some+antacids+more+effective+than+others&pg=PA127&printsec=frontcover
