Quantitative Analysis (HSC SSCE Chemistry): Flashcards
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Four main types of specialised titrations
Four main types of specialised titrations
pH curve, conductometric, back, redox
When is a pH meter necessary in titrations?
When is a pH meter necessary in titrations?
Dark/coloured/turbid solutions where indicators can't be seen
Where is equivalence point on pH curve?
Where is equivalence point on pH curve?
Midpoint of steep (vertical) section
Equivalence pH: strong base + strong acid
Equivalence pH: strong base + strong acid
pH 7 (neutral)
Equivalence pH: strong base + weak acid
Equivalence pH: strong base + weak acid
Greater than pH 7 (basic)
Equivalence pH: weak base + strong acid
Equivalence pH: weak base + strong acid
Less than pH 7 (acidic)
What is a back titration?
What is a back titration?
Indirect method: add excess reagent, titrate unreacted portion
When to use back titrations?
When to use back titrations?
Insoluble, slow, volatile, unreactive samples or trace amounts
What is conductometric titration?
What is conductometric titration?
Uses conductivity changes to determine equivalence point
and colours
and colours
is purple, is pale pink