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F325: Module 1: Indicators

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Total cards: 7•Content version: v4•Public deck•Updated: 8/1/2026

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#1
Front (Question)

I) What type of chemical are indicators?

Back (Answer)

Weak acids of Weak bases

#2
Front (Question)

I) What is the equilibrium equation for an indicator?

Back (Answer)

HIn = H+ + In- All in aqueous solution LHS = Colour 1 RHS = Colour 2

#3
Front (Question)

I) How would you give a rough estimate of an indicator’s pH range?

Back (Answer)

The pH range over which an indicator changes colour is approximately equal to pKa +/- 1

#4
Front (Question)

I) Name 2 common indicators and state their pKa values.

Back (Answer)

Phenolphthalein - pKa = 9.3 Methyl Orange - pKa = 3.7

#5
Front (Question)

I) Which indicator out of PP or MO would be suitable for the following titrations: Strong acid/Strong Base Weak acid/Strong base Strong acid/Weak base Weak acid/Weak base

Back (Answer)

SA/WB = MO or PP since the endpoint is within both of the indicator’s ranges. WA/SB = PP SA/WB = MO WA/WB = Neither since there is no endpoint (rapid pH change in any region of the titration curve)

#6
Front (Question)

I) Define the enthalpy change of neutralisation.

Back (Answer)

The enthalpy change when an aqueous acid is neutralised by and aqueous base to form one mole of H2O(l) under standard conditions.

#7
Front (Question)

I) What is the enthalpy change of neutralisation (roughly)?

Back (Answer)

-58kJmol^-1