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TITRATIONS - chemistry

charlie08

just wondering whether we need to know how to do titrations for chemistry module 2 or 3. anyone know??

Reply 1

milliondollarcorpse

16

What exam board?
Can someone please explain titrations to me, I really don't understand the method for it. All I know is it's a quantitative method to determine the concentration of a solution, I think so anyway.

Reply 2

Ekpyrotic

13

A titration is the combination of two separate solutions; one with known properties (i.e, concentration) and another with an unknown property. It enables you to find that unknown characteristic.

The combination of the solutions will produce a distinct change when the 'right' proportions of each solutions have been combined. (the change might come when an acid and alkali neutralise, the change itself is usually displayed with the use of an indicator).

I'll describe an example to clarify.

HCl (aq) + NaOH (aq) ----> NaCl (aq) + H2O (aq)

Say that we wanted to find the concentration of the HCl. We could place a known value of NaOH in a Erlenmeyer flask with a few drops of indicator. Now we start adding drops of HCl, until the indicator shows neutral. We record how much HCl has been added (the titre value) and can now work backwards to find out the concentration of HCl.

Reply 3

Interchange

14

You probably need to know how to do titration calculations involving neutralisation.

Reply 4

RJFarmer

11

titrations...at GCSE?

I never even knew about the things until my first year of AS.

What exam board is this for please? As maybe my school just followed a syllabus that didn't include them.

Reply 5

milliondollarcorpse

16

RJFarmer

titrations...at GCSE?

I never even knew about the things until my first year of AS.

What exam board is this for please? As maybe my school just followed a syllabus that didn't include them.

Well mines OCR, the GCSE science syllabus changed and we're the first year to do it.

Reply 6

RJFarmer

11

milliondollarcorpse

Well mines OCR, the GCSE science syllabus changed and we're the first year to do it.

Thanks for clarifying that for me. The new syllabus sounds a lot more challenging.

Reply 7

milliondollarcorpse

16

RJFarmer

Thanks for clarifying that for me. The new syllabus sounds a lot more challenging.

Well some people think differently. Obviously I don't know the old syllabus so I can't really compare this one with anything, but although there is some challenging stuff in the extended units, a lot of it really is basic, and there's a lot of multiple choice questions and not much writing :smile:

Reply 8

Aaron_1507

11

its aqa C3 the third unit you need to know it for.

Reply 9

marshallj

i think it is in OCR C6 chemical synthesis

Reply 10

Mr Nonsense

13

you need to be able to do the titration calculations (e.g. work out the concentration of this solution of NaOH) and also describe how to do titration experiments (but i doubt that will come up as it was in the jan 08 paper)

that is for AQA C3

Reply 11

Hollijones

im doing edexcel and you only need it for the thrid module.

Reply 12

RoadWarrior

15

It was in the IGCSE as well...

Reply 13

XxCurly-TopxX

6

Im doing AQA
i think they skim over it in modular 2
but theres a whole chapter of it in tripple
oh the joy

Reply 14

Aaron_1507

11

hughey

you need to be able to do the titration calculations (e.g. work out the concentration of this solution of NaOH) and also describe how to do titration experiments (but i doubt that will come up as it was in the jan 08 paper)

that is for AQA C3

You reckon? hmmmm hope it doesnt but rather it did than 'how science works' questions. We'll see are you taking the exam? (aqa C3)5th june :rolleyes:

Reply 15

simcard2007

Ekpyrotic

A titration is the combination of two separate solutions; one with known properties (i.e, concentration) and another with an unknown property. It enables you to find that unknown characteristic.

The combination of the solutions will produce a distinct change when the 'right' proportions of each solutions have been combined. (the change might come when an acid and alkali neutralise, the change itself is usually displayed with the use of an indicator).

I'll describe an example to clarify.

HCl (aq) + NaOH (aq) ----> NaCl (aq) + H2O (aq)

Say that we wanted to find the concentration of the HCl. We could place a known value of NaOH in a Erlenmeyer flask with a few drops of indicator. Now we start adding drops of HCl, until the indicator shows neutral. We record how much HCl has been added (the titre value) and can now work backwards to find out the concentration of HCl.

thanks for telling us... but he didnt ask for this :mad:

Reply 16

Shask

7

For AQA Chemistry we need to know how to say, get the conc. of Compound A from the Conc. and Volume of Compound B and the amount of Compound A needed to neutralise it.