Does equipment list need quantity of solutions used? (1 Viewer)

[Sanical]

1) Say you used 10mL of hydrochloric acid, do you write that in the equipment list or do you simply write hydrochloric acid?
2) Do you need to write the concentration of the acids used?
3) What about flasks? Do you need to specify that it's a 200mL volumetric flask or a 500mL volumetric flask etc?
4) Do you need to specify that you used more than one test tube e.g. 5 test tubes?

Remember, this is all for the equipment list.

 

[angelarr]

Yes, it's better to be specific. Especially when questions ask you to describe and justify the way in which you conducted a particular experiment.
For e.g. the bromine water test. Here is what I would have written
1. Experiment was conducted in a fume cupboard and in the absence of light
2. 5 mL of cyclohexane was placed in test tube A and 5mL of cyclohexene was placed in test tube B
3. 5 drops of bromine water was added to both test tubes A and B
4. Both test tubes were shaken three times and colour changes were recorded

Justification: cyclohexane and cyclohexene are used because they are colourless liquids and therefore colour changes are easily observed.
bromine water is used instead of bromine solution as bromine solution is highly toxic. Diluted water is less toxic but only minimimal amounts are used to minimise waste and prevent over exhalation etc. Also penetrating odour therefore fume cupboard
Bromine water is a limiting reagent to ensure that a clear colour change is observable.

 

[study-freak]

Oh wait, EDIT: is this for experimental reports? in which case you'd be more specific. I replied as below assuming that you're writing your answer in an exam situation.


the short answer is no.

You don't generally need to specify conc or volume or mass, etc except very roughly (e.g. 5 drops, excess, etc).
So for example, you won't need to say 0.5mL of 10M HCl etc etc. You'd just say conc HCl was used to ... (and indicate approx. quantity if important to the method/safety).
The same with test tubes and it's superfluous to say how many test tubes you've used since it should be obvious. E.g. added cyclohexane and cyclohexene to separate test tubes - guess how many test tubes you've used so far? DUHH...

 

[Sanical]

Ah ok then. I swear we were told to specify. Even if you had to make it up (as long as it sounded reasonable)

 

[Kimyia]

I guess the specificity varies depending on the situation but you should always state the concentration of the acid your using.