BenSon

Yggdrasil is right, also if it was attached to another bond then none of those answers would be right because then carbon one would have a 0 charge and the only answer with 0 for the first carbon is answer (i) and that is clearly wrong. ~Scott

This is how I think it works neutral water 10^-7 for H+ and OH-. The HCL is 10^-8, If you plug that value into the standard pH formula you get pH 8 wich isn't realy true because you've added acid to neutral water it should be slightly acidic. By adding the the two amounts of H+ ions together you get the true pH. As for why it is only for 5% rule, My guess is that if the acid is stronger and the H+ from the water is less then 5% then the difference is negligable so we don't calculate it. Example: Ph of 1x10^-4 M HCl" We plug that into the normal formula -log(1x10^-4) =pH of 4 If we do it the same as the 5% rule we get -log((1 x 10^-4)+(1x10^-7) =pH of 3.999956 ~Scott

Alrighty what do you need us for then ? ~Scott

for a pH value of 6.98 the concentartion of acid would have to be (1 x 10^-6.98 M), I think, does the answer have working out? ~Scott

-log (1x10^-8) = pH of 8 ~Scott

I wan't realy surprised by the violence of the reaction more by how long it has been going for still moderately bubbling after 10 hours. But I am less surprised now that I found it to be 3.75mol/L ~Scott

Well I bit the bullet and titrated it with a syringe. The verdict is 3.75mol/L, thats sounds more like battery acid, then a wimpy 0.4 ~Scott

Ok I got some car battery sulfuric a while ago and today I needed some hydrogen so I dumped a nail it 25ml. Well after I got the Hydrogen I needed I decided to leave the nail in there to see how much it would disolve. Here I am about 6 hours later and the nail is still moderately reacting. How concentrated do you think this acid is? The nail was not galvanised and it has been sitting at room temperture all day. I did some very rough calculations when I first got it and worked it to be about .4mol/L althought this calc was done rushidly and poorly. I can't be arsed titrating it so can anyone give me an idea on how conentrated you think it will be? ~Scott

Too True `Scott

Yeah you can mostly use the ionic charge and that will get you through alright. But there are exceptions such as superoxides, here is a quote from wiki these are the rules you should know when using oxidation numbers There are a number of rules that can be used in determining the oxidation number of a molecule or ion: Enjoy, I always foreget "Oxygen has an oxidation number of −2 in compounds, except (i) in the presence of fluorine, in which fluorine's oxidation number takes precedence;" that one ~Scott

To my knowledge string theory is mathematicly sound. That being said if the theory is not disproved mathematicly it should need to be tested in another way. ~Scott

Yeah thats right its just good to remeber some standard oxidation rules for common elements like oxygen and hydrogen, their oxidation numbers will change depending on what they have bonded to. ~Scott

Has anyone done this yet? See where i've highlighted, to me this is not a problem, but for you it is. Ideas of what is scientific have been changing throughout history you have even used this as an example. Don't be so clamped done on your own definition or mine for that matter they will change with time. Well, here is yet another way in which we are different, I don't hold my personal opinion on topics which are unfalsifiable by definition above other peoples, arguing opinions on such topics is a futile exercise. I'm sorry if i've offended you i see your are a 'physics expert' is string theory your game? I'm sure that string theorists would disagree with me and thats their decision to make. I will say it again I disagree. ~Scott

Look here is where our opinions differ, You say, "No, what is necessary is that the claims made by the theory be such that if the experiment goes against the prediction, then the theory is proven wrong." I say, there is no such experiment so the theory can't be proven wrong so by your definition it is not a theory. Where I highlighted is the difference between us, for me that is a prerequist. And as I've said i disagree with this. That was a generalization in answer to a different question not adressed in this thread. The "bin" I put them in is based on my opinion of said theories religion ect. I dislike you saying my personal opinion is "not right" thats all I have to judge topics that have no evidence as you said are "unfalsifiable" this includes string theory (At least for the time being, as I've already said). I think it is apparent how I define philosophy and theory due to my previous comments you can work that one out for yourself. ~Scott

While the predictions made by said theories may tie into the logical structure of that defintion of a theory. That is just the first step. The predictions made by a theory have not only to be theoreticaly possible to test but physically possible. Your saying that the claims made by string theory can be proven wrong by experimentation. I ask you, what experiment can prove wrong all the claims of string-theory? Once the "philosophy" can be tested (In real life) to be proved right or wrong whichever school of thought you choose, it becomes theory. ~Scott

EDTA will not only attach itself to Ca cations but also the Mg and Al ions as well. So if you are specificly looking for the concentration of calcium cations then you will need to use another indicator. But if you are looking for total water hardness then the EDTA will work fine. To dilute the samples just use a volumetric flask and pipettte, dilute with distilled water. ~Scott

I can't think of any OTC ones at the moment. Perhaps you could get some from your school labs you don't need a large amount to make enough ester to smell it, so they may give you some. If not you may have to "borrow some" ~Scot

Dosen't that make it confined? ~Scott

We did this AGES ago in chem and I'll see if i can remeber it. The CO2 is in equilibrium with dissolved carbonic acid. You want to increase the pressure as the equilbrium will shift to oppose the change and dissolve more gas. The dissolving process is (if memory serves) exothermic so once again if you lower the temperature then it will resist the change and dissolve more gas. So keep it cold and pressurised, thats your best bet. ~Scott

Thats the basic procedure but its a bit more delecate then that, it also dosen't have to be acetic acid it can be and carboxyl group. As for the name it all depends what system you use there are often many 'correct' names for the same organic compound but the one you've used is fine it implies the structure and is chemically correct. However I mostly use ethanoic instead of acetic, its just personal preference and what you (or your markers) understand the best. ~Scott

BenSon brand Home remedy for itchy and red mosquito bites : Now this will sound a bit wierd but just hear me out. Spit on the bite then punch it(hard) a few times. (rinse and repeat as necessary ) Strange I know but it does work. ~Scott

Try making some esters they are not particularly hard and is a good beginner experiment in orgo. Have patience though its not the speediest of reactions, but quite satisfying. Also avoid esters that use butanoic acid they aren't harder to make but the smell of the acid is definately one to do under a fume hood. ~Scott

Sorry Dak I can't read german ~Scott

I also broke my pinkiy just above the knuckle. Thought years ago, once they strap it it dosen't hurt as much, I can't remember how long it took to heal thought. It sticks out at a bit of an odd angle still when my hands are limp, but its not like i can't make a fist or anything. ~Scott

Incorrect, I'm sure google can help you with this one. ~Scott