John Cuthber

Since phenolphthalein is colourless in netural solutions and colourless in acid solutions I can't see how you could use it (and only it) to measure the strength of an acid like vinegar.

You could use it as the indicator in a titration to get much better accuracy than a pH meter will give you.

Even with the sort of equipment I used at school a titration could tell if the vinegar was 5% or 5.05% With practice and good experimental design you should be able to distinguish 5% from 5.01%

I wonder if there's something in the air in the dessicator-(as an outright guess with no supporting evidence, perhaps HCl from hydrolysis of CaCl2) that reacts with the nickel DMG.

Sodium azide is not explosive or shock sensitive. The airbags are filled with N2 by the reaction of NaN3 with KNO3, silica and other ingredients. These mixtures are explosive. The silica is there to trap most of the sodium that is formed in the reaction by convertig it to sodium silicate.

On the other hand, the stuff is roughly as toxic as cyanide and hydrazoic acid is explosive.

Ozone is blue and there are a few other coloured gases.

I'd like to know what Peristar's aplication for this is.

What's implausible about it?

Chlorides (and the other halides) do a good job of corroding stainless steel. Sodium carbonate (washing soda) would be a better choice. Magnesium sulphate would be better still- it's not so corrosive to skin.

The reaction of NaOH and Al certainly gives H2 but, as UC points out, it's not nice stuff to work with.

Dissolve tin in sulphuric acid.

There is no water in the diagram 14.30 of that book.

What was the drying agent in the dessicator?

If there were an easier, more ecconomical way of doing it, they wouldn't use the Bayer process.

The electrochemical process might work reasonably well but you need to realise that as the concentration of iron in the solution falls the voltage needed to reduce it will rise. At some pont you will reach a potential where it's easier to reduce water to hydrogen so you won't remove all the iron

You can also use relays to do this sort of thing. They are a bit slow.

It's also fairly acidic so it may goagulate proteins in the blood.

You might want to look at the fatty acids contained in coconut oil and, for exaple, tallow or olive oil.

If you carefully add an excess of NaOH you will disolve the Al as sodium aluminate and leave the iron as "Fe(OH)3".

It would have been easier to dissolve the bauxite in NaOH to begin with.

That wiki page gives the molecular formula.

ROFL.

....a large number of senior citizens with pace makers were found dead in their tracks in a neighborhood inhabited by cyclists with futuristic looking bicycles.....

I'm glad it amused someone because I can't see this idea doing anything else.

I'm sorry to hear of your misfortune but to be honest I don't think you will have much luck.

It would be cheaper to replace the milk than to test it.

The best advice I can give is to speak to a doctor about it. If they think it's salmonella then they might be able to get it tested as part of some public health program.

If you have recovered in a day or so then it's probably some other "bug". Salmonellosis iusually lasts longer.

There's more information about it here.

http://en.wikipedia.org/wiki/Salmonellosis

Captain,

Did you realise that if it were true that those were the only components of vegetable oils then there would be no unsaponifiable stuff?

In real fats there are things like phytosterols and the fat soluble vitamins.

At least some of those would act as UV screens and free radical traps.

How healthy these are is probably open to debate- too large a dose of some vitamis is seriously toxic, but if you were short of them then this stuff could be a lifesaver. For most of us the answer is probably somewher in between.

I have visions of a newspaper articlew at some stage in the future describing the horrific injuries inflicted on two cyclists who tried to pass eachother on bikes of this sort.

"Regretably, the emergency services were unable to cut away the wreckage as the "jaws of life" became irrevokably attached to the real wheel of one of the bikes.

First aid treatment was also severly hindered until a bystander (who refused to give his name) supplied a box cutter with a ceramic blade which was non magnetic. The man was last seen heading in the direction of the local flying school. Authorities would like to speak to him urgently.

The issue was further complicated because, while both parties has credit cards with them which should have vouched for their abillity to pay medical costs, for some reason neither of their cards worked and nor did those of anyone else involved.

A passing physicist was asked to look at the combination of gyroscope forces and magnetic interactions and said "Bugger that!- I'm taking up flower arranging".

BTW, are you planning to go throuhg the whole commodities market one item at a time?

Why do you want to know all these prices?

Is it just me who thinks "It's just a joke: get over it"?

OK, but it wasn't the water that was a hazard was it?

What radioisotopes were you sloshing about?

Crude iron ore and the stuff made as a by-product of aliminium making are probably even cheaper.

Some of the silicates can be considered as polymers and are inorganic.

Just in case anyone wondered, the term for a few polymer molecules stuck together is oligomer.

Nitric's idea of "simple" would rule out most nylons, a lot of polyurethanes, aand some other well known polymers like kevlar and polycarbonate. However, the definition of all the terms you ask about probably depends on circumstances and the people talking about them

Oops, I read it as a question. Never mind, I bumped your thread for you.

Anyway, from here

http://www.bplans.com/plastics_recycling_business_plan/market_analysis_summary_fc.cfm

"The Company has chosen its target markets because recycled PET (RPET) is in high demand as flake resin by converters, as roll stock sheet used to produce high visibility packaging and as high strength strapping for the lumber industry. Sales are price-sensitive, so that proximity to markets and feed stock source provide a competitive edge. Replay Plastics identified an opportunity to take advantage of both circumstances in the western United States.

RPET Flake

Total market demand is reported as 1.2 billion pounds per year. Since only 800 million pounds are processed in the USA, consumers are forced to look at wide spec virgin PET (virgin resin that is outside of spec but still usable) which is normally sold at a discount to virgin prices, but still higher than recycled (RPET) pricing. Some manufacturers are also forced to import materials from Mexico, India and South America. Some converters are being forced to use more expensive virgin resin.

The current pricing for virgin resin is $0.65-0.73 per lb. and $0.42-.53 for RPET flake. The spread between the two has traditionally been maintained at approximately $0.20 per lb.

PET Film & Sheet

The total reported market of extruded film and sheet is 872 million pounds, of which identified industry usage of RPET is 160 million pounds.

The reported market demand (to replace virgin PS, PVC and PET) if RPET was available is estimated at 1 billion pounds.

Current pricing for RPET sheet is $0.70-0.79 per lb.

RPET Strapping

The total reported domestic plastic strapping market is 240 million pounds. Of this market, industry usage of virgin polypropylene is 132 million pounds and of PET is 108 million pounds.

It is generally accepted in the industry that less expensive strapping made from RPET could not only take over the polypropylene strapping market, but convert as much of the much larger and more expensive steel strapping market as RPET strapping was available.

Current pricing for RPET strapping is $0.90 -1.08 per lb."

Slightly more really really helpful I hope.

thanks man ill get to work.

"We choose to go to the moon in this decade and do the other things, not because they are easy, but because they are hard".