pH

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Flashcards on pH, created by J yadonknow on 10/01/2018.
J yadonknow
Flashcards by J yadonknow, updated more than 1 year ago
J yadonknow
Created by J yadonknow almost 7 years ago
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Question Answer
Explain the curve of a typical titration curve Equivalent point= centre of the vertical section of the pH titration curve Vertical section= pH rises rapidly on addition of very small amounts of base/acid. Acid/base are in similar concentrations here.
What occurs at the end point of a titration? The indicator contains equal concentrations of HA and A- and the colour will be in between the two colours of the HA and A-.
Describe the addition of a basic solution to a strong acid Equilibria is shifted towards HA in acidic conditions or A- in basic conditions On addition of OH- 'OH reacts with H+ to form H2O 'Weak acid HA dissociates, RHS shift Colour changes first to mid-point colour then finally to A- as equilibrium is shifted to the right
What are the equation values shit of an indicator? Weak acid [HA]=[A-] Ka=[H+] pKa=pH
What is the pH at the end point? pH=pKa of HA
How do you choose indicator? Use an indicator which has a colour change that coincides with the vertical section of the pH titration curve
What are ampholytes? Salts of weak acids and weak bases Hydrogen salts of di-tribasic acids Compounds with acid/base functional groups pH is independent of concentration
What is a salt? Products of neutralisation reaction
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