Monday, December 28, 2009

A beaker contains a clear color less liquid.?

If it is water, how could you determine whether it contains dissolved table salt?


Do not taste it!!!!!!!!!!!A beaker contains a clear color less liquid.?
WELL! take a similar beaker and pour the same amount of pure water(from the same source too) in it....then add your table salt into it continuously , until it reaches its 'dynamic equilibrium'....don forget to note the amount of salt you added to make it reach at the equilibrium.





NOW, take the former one and add the salt into it too.........until it reaches its dynamic eqbm. If you see that you dint need the same amount of salt you added into the other one but lesser than that, you can be sure........THere was some salt in it; )





i hope you know abt the dynamic equilibrium. ie; when we add more n more salt the solution gets super saturated and hence the salt crystals begin to crystallise out due to the establishment of eqbm.A beaker contains a clear color less liquid.?
Put lead (II) nitrate, Pb(NO3)2 in there, or any kind of soluble lead (II) compound. The lead (II) cations will bond with the chloride ions (assuming this is NaCl), and form a PbCl2 precipitate, which is visibly recognizable.





If you want to know how much salt, weigh the amount of PbCl2 you have, and then use stoichiometrical ratios in the following reaction:





2NaCl(aq) + Pb(NO3)2(aq) ---%26gt; 2NaNO3(aq) + PbCl2(s)
Test it for sodium and chloride...table salt is NaCl.





Na: Run a flame test. Dry a small portion on a platinum loop; put it in a Bunsen flame. A bright yellow flame indicates Na.





Cl: To a small portion, add AgNO3 soln. A dense white ppt indicates Cl (AgCl ppts out). To make certain that the ppt is not some other silver halide, add xs NH4OH and heat it...only AgCl will remain insoluble.
find the boiling point of salt, if it less than that of water, you could boil off the water, leaving the salt behind, or if less than the boiling point of water, you could trap the evaporate in coil and cool it down and seperate the salt in another beaker.
if you have to check for TABLE SALT then the easiest way is to BOIL it .





You'll be left with salt in the end.





(like it - then mark it as best answer, thanx )
i think you could filter it and see if particles remain.

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