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“How could you determine the concentration of a specific molecule, ion or…
“How could you determine the concentration of a specific molecule, ion or active ingredient in a household item?”
Concentration
Concentration refers to “the amount of solute present in a known amount of solution or solvent.” (1)
Household Items (2)
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Standard Solutions
A standard solution is a solution of accurately known concentration, prepared by dissolving a precisely weighed amount of a stable, pure compound in a fixed volume of solvent. (5)
How to Determine
Spectrophotometry: Spectrophotometry measures light absorption by a substance to quantify it, using specific wavelength ranges – allowing for the concentration of its solute to be determined. (3)a
Titration: Titration measures an unknown concentration (analyte) by reacting it with a solution of known concentration (titrant) until the reaction reaches completion. (4)
Acid-Base Reaction: An acid–base reaction occurs when an acid and a base completely neutralise each other. The point at which the exact amounts have reacted is called the equivalence point. (7)
How to find Equivalence Point: An indicator (phenolphthalein, methyl orange, etc.) is often added to the analyte, changing colour precisely when the equivalence point is reached. (6)
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