## Question

secondary 4 | A Maths

Anyone can contribute an answer, even non-tutors.

##### Anonymous

chevron_right chevron_right

hi I need help with part b and d

Date Posted: 4 months ago
Views: 61

clear {{ downvoteCount * -1 }} Downvotes
##### Arnold K H Tan's answer
1st
AT
Date Posted: 4 months ago
Anonymous
4 months ago
hi, why do u need to write the ionic equation of the reaction first then compare the number of moles? why cannot compare directly?
Arnold K H Tan
4 months ago
You can compare directly, if you know how many moles of soluble ions are present for the reactants and for the products. If not sure, best to write out the ions for better understanding. Note that what I wrote out is not the simplified and final ionic equation.
Anonymous
4 months ago
oh so either way you still need to compare the number of moles of ions on both sides, just that writing the ionic eqn would make it easier to see?
Arnold K H Tan
4 months ago
More or less. Basically, you have to understand that electrical conductivity of solutions varies proportionately to the concentration of ions present. ( or in this case, number of ions, since concentration was not provided).
Anonymous
4 months ago
ohh I see, thank you
Arnold K H Tan
4 months ago
Np