4.2 - Standardisation of a Hydrochloric Acid Solution (Leaving Cert Chemistry): Flashcards
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Substance used to standardise HCl solution
Substance used to standardise HCl solution
Sodium carbonate ()
Classification of sodium carbonate in this experiment
Classification of sodium carbonate in this experiment
Primary standard
Indicator used in HCl standardisation
Indicator used in HCl standardisation
Methyl orange
Methyl orange colour change at endpoint
Methyl orange colour change at endpoint
Yellow to peach/pink
Concentration of solution used
Concentration of solution used
0.1 M
Volume of transferred by pipette
Volume of transferred by pipette
25 cm³
Why use conical flask instead of beaker for titration?
Why use conical flask instead of beaker for titration?
Allows easy swirling and thorough mixing
Why remove funnel from burette after filling?
Why remove funnel from burette after filling?
Prevents drops falling in and altering volume
Why rinse burette with HCl before use?
Why rinse burette with HCl before use?
Removes water that could dilute the acid
Purpose of performing rough titration first
Purpose of performing rough titration first
Get approximate idea of endpoint
Required agreement between accurate titrations
Required agreement between accurate titrations
Within 0.1 cm³ of each other
Safety property of hydrochloric acid
Safety property of hydrochloric acid
Highly corrosive
Safety property of methyl orange
Safety property of methyl orange
Flammable (contains ethanol)
Why HCl is not used as a primary standard
Why HCl is not used as a primary standard
Not pure enough; concentration must be determined
Mole ratio of HCl to in reaction
Mole ratio of HCl to in reaction
2 moles HCl per 1 mole