Ch 6 Flashcards
What are indicators
Weak acids or bases which are large organic molecules which change colour in response to changes in ph of the solution they’re dissolved in. their conjugate acid and base are two different colours, so depending on the PH, the colour of the conjugate acid in a low ph solution, or the conjugate base in a high ph solution will be the more predominant colour.
what is universal indicator and when is it used?
it is a mixture of many indicators and detects the ph of a solution
what is bromothymol blue indicator?
yellow in acidic solutions and blue in basic solutions and green in neutral solutions. the transition point is PH 7
what is the transition point of an indicator?
where concentration of conjugate acids and bases are equal at equilibrium. also known as the mid point
what is methyl orange indicator?
red in acidic solutions and yellow in basic solutions. Changes colour from red to yellow over ph values of 3.1 to 4.4
used in the analysis of weak bases
what is phonolphthalein indicator
in acidic solutions its colourless while in basic solutions its pink. changes colour over the ph range of 8.3 to 10
used in the analyse of weak acids.
indicator range
range of ph over which an indicator changes colour
how can you determine equivalence point of a neutralisation reaction
an indicator can be used to determine when The ratio of acids to bases in a reaction are equal at equilibrium,
