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Karteikarten von J yadonknow, aktualisiert more than 1 year ago
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Erstellt von J yadonknow
vor fast 7 Jahre
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| Frage | Antworten |
| 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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