[Chemistry] - Challenge for 'O' & 'A' Level Students

UltimaOnline SG

arxoz,

Calculate original [Ag+] (based on Ksp). Calculate new [SO4 2-] (based on new solubility). Calculate new [Ag+] (based on Ksp). Calculate [Ag+] needed to be added (ie. the difference). Calculate for 250cm3.

yiha093 SG

You kidding me?

At my level now (uni), even though the chemistry module I take is just a for-general-knowledge type, I still have to do a fair bit of differentiation/integration/summation and what-nots.

And oh, Microsoft Excel....I spend a fair bit of time plotting the mixing ratios graphically.

Just do it la.....after a while Maths becomes fun.

i sec school only ma. so asking la. i dunoe anything. LOL

arxoz SG

Ultimaonline, i did exactly the way u r asking me to do but i am not getting the answer. Why?

Can you post a detailed answer?

thx for ur help.

UltimaOnline SG

Ok, but before I post it, isn’t there anyone else here taking ‘A’ levels that can solve this? I’ll give this 24 hours, see if anyone else can successfully work out the answer.

UltimaOnline SG

arxoz, post your step-by-step solutions here. You’re probably only a single step off, so post your working here and I’ll point out your error/misconception, if any (it’s always possible you interpreted the question in an alternative way, and that your answer is arguably also correct).

UltimaOnline SG

arxoz,

Calculate original [Ag+] (based on Ksp).
0.03037 M

Calculate new [SO4 2-] (based on new solubility).
0.001 M

Calculate new [Ag+] (based on Ksp).
0.1183

Calculate [Ag+] needed to be added (ie. the difference).
0.08793

Calculate for 250cm3.
0.02198

manyu882 SG

lol when i saw the first line of the qn i tot is some kind of chim chemistry.. but as i read on, onething straight into my mind is that it looks more like math. well, people with little knowledge of Chem can do it.

i'm gonna tell u, this is some kind of real life questions you have to answer . and its more than this..in the industry , its not so straight forward which the questions are given to you. you have to construct your own question given a senario .

poly grad engineering student here.

UltimaOnline SG

It’s not merely “in the industry”, it’s “in life”. Every individual must critically question and frame the purpose of his/her life (as opposed to cruising through life aimlessly or blindly, zombie-like, going-along-with-the-crowd, following soceital dogma, meaningless), and decide what the validity, purpose and meaning of his/her life is.

What we call, the existential program for a particular lifetime for a particular individual. This isn’t something that anyone or anything outside of you (no external authority, government, domineering parent, organization, peers, or religion) can impose upon you (that is, if you’re intelligent and have a sufficient degree of self-awareness), but something (ie. the meaning and purpose) that you yourself find higher meaning, relevance and purpose for yourself, something that you choose for yourself at all levels of your soul.

You are the captain of your own destiny. Will you be a wasteful captain, or a wise one?

arxoz SG

Since the solution is saturated, the concentration of SO42- is in the solution is0.0152 moldm-3(solubility based on Ksp). So after the addition of silver nitrate, the new concentration of so42- should be 0.0152+0.001.

But in your workings, you did not consider the solution of so42- in the saturated solution. Why?

UltimaOnline SG

Did you consider that some of the SO4 2- ions will LEAVE in the form of Ag2SO4(s) ppt?

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