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Determine the acid concentration of a common household substance/food -…
Determine the acid concentration of a common household substance/food
Common household substance/food
Lemon juice - citric acid
Apple Juice - malic acid
Grape Juice - tartaric acid
Milk/dairy products - lactic acid
Must be something used commonly around the house which has some acid content, no rare chemicals found in special labs
Convenient to come across
If used commonly, it must be non-toxic, at least in diluted form, with less concentration
Could be something that is eaten/drank
Acid concentration
Can be found through an acid-base titration
Bases : sodium hydroxide, sodium carbonate, etc, lithium hydroxide
Standard solution of known concentration will be made of the base so it can be conducted using the titration equipment
Indicator will be used to observe the colour change of the mixture as a result of the pH change of the neutralisation reaction
Phenolphthalein?
Methyl Orange?
Stoichiometric equations will be used to determine the final experimental concentration of the acid
c = n / v (to find the number of moles, and the concentration depending on volume)
n = m/M (to find the mass of the anhydrous base needed for the standard solution)
g/L = mol/L x molar mass (concentration in g/L)