Hello Harprit, R2.3.4 gives X(g) ⇌ X(aq) as an example so I guess students could be asked to explain why a bottle of carbonated water fizzes when the top is removed from the bottle and then eventually goes flat if the top is left off.
R2.3 The extent of chemical changeHello Geoff, In R2.3.4, the IB guide talks about Le Chatelier's Principle to physical equilibria and gives a (g) / (aq) as an example. A very old IB question came up looking at a (l) / (g), and what happens when you increase the volume of liquid....
R2.3 The extent of chemical changeMe too! As far as I know, there are no other issues with sodium hydroxide in the burette. My students frequently do it that way round. We just make sure that we don't leave the sodium hydroxide in the burette, and we rinse it out afterwards. The etching...
Acid-alkali titrationIn general, I find it easier to identify the colourless to pink colour change rather than pink to colourless. Is there any major issue with switching the acid and base other than that the sodium hydroxide may cause etching or other damage to...
Acid-alkali titrationHi John Yes, that's correct.And I can confirm that the guide, Reactivity 3.2.2, says: Deduce redox half-equations and equations in acidic or neutral solutions. I believe candidates might be asked to balance a...
R3.2 Oxidation & reductionHI, On this, can I confirm that in neutral conditions, they should write half equations using H+/H2O and that they do not need to use H2O/OH- at all when creating half equations (as basic conditions are not part of spec)? Thanks, John
R3.2 Oxidation & reductionThanks for your advice. I have put up a case on IB Answers
R2.2 Rate of reaction & collision theoryThank you!
R3.1 Neutralization reactionsThat is a fair point, SusanAs temperature increases, the rate increases; the largest contributor to this change, by some margin, is the shift of the Maxwell-Boltzmann curve, which increases the probability of successful collisions...
R2.2 Rate of reaction & collision theory
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Hello, A student of mine is considering as a possible idea for her EE: a study of the effect of varying D-glucose concentrations on the intial reaction rate and peak absorbance of hemoglobin -catalysed phenolphthalein- hydrogen peroxide oxidation,...
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