pH | Flashcards

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

pH

	Created by J yadonknow over 6 years ago