Assumption question

[appianway]

Did it specify that it was added to completely pure/deionised water in a container that had been cleaned properly? If not, it's not a fact. They do react in a 1 to 1 molar ratio, but we make the assumption that there wasn't any of the substance/ions initially in the container. We also assume that the [H+] ions don't react with anything else, so there are definitely a range of assumptions being made. This is certainly correct. The question said ONE assumption; it didn't say THE assumption.   

[m@tty]

Actually, it's never a fact. There is always going to be some H+ from the self-ionisation of water. So in saying that the only H+ in solution is coming from the acid you're assuming that the ionisation of water is negligible. At very high temperatures it becomes important..

[vexx]

I said the exact same thing but apparentally its wrong? reason was that this is not an assumption. its a FACT

its not a fact...

So that assumption is correct? If so then I just went one higher than my estimation

I dont think that is an assumption. If one molecule of lactic acid dissapates one H+ ion will be formed and one CH3.....- ion will be made..... t

However what if the container is contaminated and there are traces of CH3CH(OH)COO- already inside, hence we are assuming that [H+] is exactly equal to [CH3CH(OH)COO-] after ionisation. Just thinking..

i agree becca, you should be right in assuming that these two exactly equal each other, this assumption is needed for the calculation - so clearly it is a correct assumption to make.

[98.40_for_sure]

YES VEXX THATS WAHT I PUT. LOVE YOU BUDDY

[vexx]

YES VEXX THATS WAHT I PUT. LOVE YOU BUDDY

hahah yayy you are going to smash this chem exam!!!
well done brooooooo.

[D27RII]

assuming that temp = 25 degrees is acceptable
assuming that ATM = 1 is also acceptable

they are the conditions under which the K values are empirically determined.

U can also assume that all the solid 4.5 grams of lactic acid dissolves. U can assume there is no lactic acid already in the container etc.

[kenhung123]

can you say assume that no strong base was added coz that would change the results also.

[D27RII]

can you say assume that no strong base was added coz that would change the results also.

sorry I dont get this assumption?
why would a strong base be added?

[m@tty]

Nah, I don't think that would be accepted.. It's kinda .. irrelevant.

A valid assumption is also that there was not a meteorite strike which spilled the entire solution. Or that no one urinated in the beaker.. But they too are irrelevant..

Valid assumptions, but they wouldn't be accepted.

[D27RII]

Nah, I don't think that would be accepted.. It's kinda .. irrelevant.

A valid assumption is also that there was not a meteorite strike which spilled the entire solution. Or that no one urinated in the beaker.. But they too are irrelevant..

Valid assumptions, but they wouldn't be accepted.

lol

[kenhung123]

can you say assume that no strong base was added coz that would change the results also.

sorry I dont get this assumption?
why would a strong base be added?

lol i was playing and somehow matty came up with funnier ones LOL