Chem question..please help!?

Question

Why is it necessary to test for complete precipitation if a supernatant solution is going to be subsequently tested for ions?

a. Additional product formed may be added to the first precipitation to provide additional solid sample.
b. There must be an excess of the added reagent present in subsequent tests.
c. It is necessary to increase the volume of the supernatant fraction so that subsequent tests are readily observable.
d. The presence of unprecipitated ions in the supernatant may react with subsequent reagents added and obscure the results of tests.

Answer 1

d..if you haven't precip'ed everything out of the supernatant, the unprecip'ed ions will show in your test, and throw off your results.

Answer 2

OMG There have been nasty, huge long coke lines in the sky all summer, but like the guy above me stated, they let up a bit over the week, I guess until the storms passed. and is it any coincidence that everywhere else, including Canada and the UK, there have been storms every single day? You can SEE them creating the rain, Clear blue day, then BOOM til the chemtrails come, nasty white streaks messing up the sky, using biowarfare, weather modification, drugging us with barium, aerosolized prozac and valuum and god knows what else, HAARP is probably in on it, And all these new generations never remember the skies without those giant nasty white streaks, they are actually being convinced that it's normal, and 'contrails' have always looked that way! can you believe it! I'm telling you, there must be some kind of drug in there, because HOW can SO many people, old generations and younger, walk around in a daze, not noticing those freako lines in the sky? Do the older people remember they were NEVER there ten years ago and previous even though there was ALWAYS heavy air traffic? Everyone seems to have such a short memory span these days! Between whatever is in the chemtrail soup, the fluoride, the medication, the vaccines, I swear, we are turning into a retard population. Thank god there are still people aware and conscious, ha? we are going to hell in a handbasket.

Answer 3

Supernatant Solution