yeah you’re rightView attachment 39856
i got D but answer says C?
This question comes from the 2021 NEAP paper. Some versions floating around have a note added that the correct answer is D rather than C.View attachment 39856
i got D but answer says C?
Both methods should work, and give the same result:View attachment 39860View attachment 39861
is this the best way to do part c ^?
i did MM whole polymer - (2n-1)H20 where n is 1000
why did i get teh wrong answer with that
Good point. The first three answers are strong acid / strong base and so the reaction is the same - hydronium plus hydroxide - and has the same enthalpy change. The reaction in (D) involves a weak acid and so the reaction will also occur as ethanoic acid plus hydroxide to make ethanoate ions plus water. This has a smaller magnitude enthalpy change as an O-H covalent bond is broken, which is endothermic.View attachment 39870
for this we do Q = -nxenthalpy change
but we just find the one which produces the largest moles of water?
but what if the enthalpy change is larger for one of the reactions ?
help with this needed and all the other posts i made below this one ^can someone give me a sample answer for Baulko chem 2020 q23 part E?
their answer doesn't rlly make sense and im not sure how to describe the different values for the concentration. like ur using two different methods but idk how to explain the diff between results
i don’t think the answer is right because like you can account for the non dissociated component with Kacan someone give me a sample answer for Baulko chem 2020 q23 part E?
their answer doesn't rlly make sense and im not sure how to describe the different values for the concentration. like ur using two different methods but idk how to explain the diff between results
It's not just using two methods, but measuring two different (though related) values.can someone give me a sample answer for Baulko chem 2020 q23 part E?
their answer doesn't rlly make sense and im not sure how to describe the different values for the concentration. like ur using two different methods but idk how to explain the diff between results
I think it’s relatively similar for all of these reactionsView attachment 39870
for this we do Q = -nxenthalpy change
but we just find the one which produces the largest moles of water?
but what if the enthalpy change is larger for one of the reactions ?
(A) n(H+) = 0.0050 mol and n(OH-) = 0.080 mol ===> H+ is limiting ===> delta_q = -0.0050 x -56 = +0.28 kJView attachment 39870
for this we do Q = -nxenthalpy change
but we just find the one which produces the largest moles of water?
but what if the enthalpy change is larger for one of the reactions ?
Yes, in (a) you have 3 sig. fig. for all data, so you can assume 3 dec. pl. in the pH.View attachment 39871
shouldn't part a be 3dp bc u actually get 3.523 and lowest sf is 3
shouldnt part b be 3sf
@carrotsss