Junior Cert Science - Chemistry Investigation

omg a kitty

Does anyone know how I would go about doing this??

Carry out an investigation to study the pH changes that take place when neutralization reactions occur between two named acids and a named base.

rorrissey

It was fairly easy, what I did was the mandatory experiment with the acid and base, where you add HCL to NaOH to slowly neutralize it. But I used a pH probe thing to find out what the pH of the NaOH was after every 1ml.
Does that make sense? xD I'm awful at explaining these things.

omg a kitty

:P yeah it helps

omg a kitty

it helped a lot actually thank yoouuu soo muchh
but i used methyl orange along with the pH probe :cool:

fisherp

omg a kitty wrote: »

Does anyone know how I would go about doing this??

Carry out an investigation to study the pH changes that take place when neutralization reactions occur between two named acids and a named base.

I was at a talk the other night by a prominent Science teacher who explained how to do this using a pH probe and a strong/weak acid (HCl/Acetic)with a strong base (NaOH). There is no need for the indicator (methyl orange) as your not looking for the endpoint. He recommended using a beaker instead of a conical flask (to hold the pH probe easier) and some form of stirring (magnetic /manual). He recommended having the acid in the beaker and the base in the burette (contrary to the normal way) to see a rise in pH instead of drop - that's the way it's done in Leaving Cert titration experiments apparently. He plotted the Volume of base added versus pH but as it doesn't mention titration in the title of the experiment I see no need to do this and I'm just going to plot pH versus time.

omg a kitty

fisherp wrote: »

I was at a talk the other night by a prominent Science teacher who explained how to do this using a pH probe and a strong/weak acid (HCl/Acetic)with a strong base (NaOH). There is no need for the indicator (methyl orange) as your not looking for the endpoint. He recommended using a beaker instead of a conical flask (to hold the pH probe easier) and some form of stirring (magnetic /manual). He recommended having the acid in the beaker and the base in the burette (contrary to the normal way) to see a rise in pH instead of drop - that's the way it's done in Leaving Cert titration experiments apparently. He plotted the Volume of base added versus pH but as it doesn't mention titration in the title of the experiment I see no need to do this and I'm just going to plot pH versus time.

thats exactly what I did, except we had the acid in the burette and vice versa.
we were a bit confused, so we just threw in the methyl orange cos we knew it wouldn't make any difference to the pH anyway:P

Mikey96

Sound lads helped alot

omg a kitty

struggling now, havent got a clue what to do after finding the amount of acid needed to neutralise the base.

rorrissey

After I neutralized it I just kept going and recorded how much acid was needed to change the base to acid...

omg a kitty

right, we ditched the ph phrobes and we're using universal indicator, we are trying to find out the amount of acid needed to change the colour of the acid
e.g. after 20mls - purple --> blue
after 22mls - blue --> green
after 22.7mls - green to yellow/green(neutral)

Desire to Aspire

Does your teacher not tell you what to do?

omg a kitty

no?
teachers arent supposed to tell you how to do your investigations(unfortunately):(

Desire to Aspire

omg a kitty wrote: »

no?
teachers arent supposed to tell you how to do your investigations(unfortunately):(

Well, they're allowed help you, and I would say most teachers do.

omg a kitty

say that to my teacher, he didnt even explain what the question was asking

Azuraiii

OT: My teacher threw the whole block of Zinc (Alkali metal) in water before during chemistry & BOOM!, twas fun but my teacher is still a complete twat. XD!

ScummyMan

omg a kitty wrote: »

no?
teachers arent supposed to tell you how to do your investigations(unfortunately):(

Really? Our teacher photocopied our booklets, took up our first draft and corrected it!

Desire to Aspire

Man.UnitedLad wrote: »

Really? Our teacher photocopied our booklets, took up our first draft and corrected it!

And so they should. Why wouldn't a teacher want to help you get an easy 10%?

ScummyMan

Yeah exactly! A bit unfair on those without help i would have thought, i wouldnt have had a clue! :pac:

omg a kitty

He just gave us the question and told us to get cracking on it :eek:, annyway I think I'm nearly done...still haven got a clue what I'm doing

bridgetown1

Azuraiii wrote: »

OT: My teacher threw the whole block of Zinc (Alkali metal) in water before during chemistry & BOOM!, twas fun but my teacher is still a complete twat. XD!

zinc is not an alkali metal. throw zinc into water and you get..... wet zinc.

bridgetown1

Desire to Aspire wrote: »

And so they should. Why wouldn't a teacher want to help you get an easy 10%?

they should NOT. it is meant to be YOUR work, not theirs.

spurious

bridgetown1 wrote: »

they should NOT. it is meant to be YOUR work, not theirs.

Exactly. No wonder third level colleges are despairing at how dependent so many current undergraduates are.

Just look at the Leaving Cert. forum - full of people wanting others to do their work, give them sample answers, give them notes, suggest short cuts round actually doing some work. Horrified when anyone suggests they do some work themselves.

Mammy, tap me egg.

Slow Show

My teacher pretty much tells us what to do, but I actually don't see how the investigations appear 'impossible' to some people. I looked at Physics and Chemistry and knew immediately which experiments and chapters they corresponded to and within a few minutes it was fairly obvious what to do. Biology is trickier, but it's not rocket science.

I'm kinda meh at the fact that my teacher is pretty much telling us what to do, it kinda irks me as I knew how to do the experiments without having it explained to me but it won't get any more marks than someone whose teacher told them everything.

Also, these are worth 25%, not 10% as far as I know. 10% is for the lab copies.

Cakes.

spurious wrote: »

Exactly. No wonder third level colleges are despairing at how dependent so many current undergraduates are.

Just look at the Leaving Cert. forum - full of people wanting others to do their work, give them sample answers, give them notes, suggest short cuts round actually doing some work. Horrified when anyone suggests they do some work themselves.

Mammy, tap me egg.

I agree with you. People in my classes are constantly asking my teachers for sample answers. My Irish teacher got fed up and didn't give us any sample answers which I think is better because it makes us study and do more work.

My science teacher isn't helping us with the experiments only guiding us by telling us if it's right or wrong but not telling us what to do to fix it.

spurious

To do an experiment yourself (and hopefully make loads of errors doing it) is by far the best way to learn how to do something. Actually, the more errors you make, the more you learn about the background processes that are going on/forces at work in the experiment.

'Learning' by being spoonfed stuff is not really learning at all and it is the method that results in least recall and understanding.

yesiambored

We have just started these projects. My teacher was on about the base in the burette too. She helps us!! We don't have enuff probes. If we use universal indicator will we be able to draw the graph

whatsthepoint?

what the hell is this about? :L SPEAK ENGLISH PLZ all these big names .. its so stupid. i have to do dis for jc aparently and i dont evn undrstand the question . ?

Desire.

whatsthepoint? wrote: »

what the hell is this about? :L SPEAK ENGLISH PLZ all these big names .. its so stupid. i have to do dis for jc aparently and i dont evn undrstand the question . ?

You do realise you only have a week left as the deadline is during the Easter holidays?

Rainbow Dash

Hey Heraty, You are probably reading this.
Help us with the Damn Experiment.

UMAD?

whatsthepoint?

Desire. wrote: »

You do realise you only have a week left as the deadline is during the Easter holidays?

ara science isnt my best subject anyway :L

Desire.

whatsthepoint? wrote: »

ara science isnt my best subject anyway :L

Well, if you don't do this, you can't get an A.

Edit: Thought you said it was your best subject. Since it's not your best subject, would you not take advantage of the easy 25% (or is it 35% altogether) going between the investigation and the experiment write-ups...

whatsthepoint?

Desire. wrote: »

Well, if you don't do this, you can't get an A.

Thought you said it was your best subject. Since it's not your best subject, would you not take advantage of the easy 25% (or is it 35% altogether) going between the investigation and the experiment write-ups...

yaaaa.. see the thing is i dont know how to do it?

Desire.

whatsthepoint? wrote: »

yaaaa.. see the thing is i dont know how to do it?

Has your teacher not told you anything?

whatsthepoint?

Desire. wrote: »

Has your teacher not told you anything?

duno

Desire.

whatsthepoint? wrote: »

duno

Probably don't deserve the 25% for the investigation so if you don't even listen.

omg a kitty

Im done this now, doing Physics atm and its much easier to understand
Is Easter really the deadline?? cos we just started Physics

whatsthepoint?

Desire. wrote: »

Probably don't deserve the 25% for the investigation so if you don't even listen.

well. no need to be so harsh. i was just stating that i do not understand the subject of science and i apologise greatly for not being as intellectualy developed and advanced as you.

Desire.

omg a kitty wrote: »

Im done this now, doing Physics atm and its much easier to understand
Is Easter really the deadline?? cos we just started Physics

Yes, I'm pretty sure it is. Our teacher is taking them up Thursday and we are having them sent away Friday.

The write-up for the Physics experiment is a lot easier than the Chemistry one, so you will probably have it done by the end of the week.

spurious

Just to confirm, Friday, 15th April is the Science Coursework deadline.
The practical exam timetable(.pdf file).

omg a kitty

spurious wrote: »

Just to confirm, Friday, 15th April is the Science Coursework deadline.
The practical exam timetable(.pdf file).

Hm not good, we just started and we only got 4 classes this week

Fizzical

Spurious, the date sent out before Christmas with the investigations was Fri May 6th whereas the date that appeared on the exams timetable recently is Fri April 15th. Our DP rang the Dept to check on the correct date and they confirmed the May 6th date for Science. It gives a couple of days leeway on the far side of Easter. Of course, like everyone else, we're trying our best to get them finished before the holidays!

omg a kitty

Fizzical wrote: »

Spurious, the date sent out before Christmas with the investigations was Fri May 6th whereas the date that appeared on the exams timetable recently is Fri April 15th. Our DP rang the Dept to check on the correct date and they confirmed the May 6th date for Science. It gives a couple of days leeway on the far side of Easter. Of course, like everyone else, we're trying our best to get them finished before the holidays!

Yeh it must be cos we still havent done anything on this this week.
Hm so 6th May is the Friday after Easter holidays, thats better I guess

FatRat

I'm struggling with the conclusion/analysis. What exactly is the difference between conclusion and analysis? What would be a appropriate to write there?

Desire.

FatRat wrote: »

I'm struggling with the conclusion/analysis. What exactly is the difference between conclusion and analysis? What would be a appropriate to write there?

Data analysis is where you comment on the results of the experiment (i.e. the graphs) and the Conclusion is where you say what you can draw from the experiment.

omg a kitty

Guys, what would be the variables and controls in the chemistry experiment?
And what will i draw for the graph in physics?