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Predict the precipitate formed when these solutions are mixed:1. Silver nitrate and...
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`AgNO_3+NaCl rarr AgCl+NaNO_3`
`AgCl ` will precipitate in white color.
`Hg(NO_3)_2+2KI rarr HgI_2+2KNO_3`
`HgI_2` will precipitate in red-orange color.
`Ca(NO_3)_2+Li_2CO_3 rarr CaCO_3+2LiNO_3`
`CaCO_3` will precipitate in cream or white color.
`Ba(NO_3)_2+Na_2SO_4 rarr BaSO_4+2NaNO_3`
`BaSO_4` will precipitate in white color.
Posted by jeew-m on January 15, 2013 at 10:16 AM (Answer #1)
Quiz Taker, Honors
Percipitation reactionsmajorly consists of reaction between ions to form a sparingly soluble(nearly insoluble) compounds so that they come out as percipitate. Therefore wrtiting thecompounds in ionic form helps. You should alsohave a good knowledge if the common lab reagents are soluble or not.
the reaction is:
AgNO3 + NaCl -----------> NaNO3 + AgCl
the reaction in ionic form is:
Ag+ + NO3- + Na+ + Cl- --------> Na+ + NO3- + AgCl
Here AgCl is not written in ionic form as it is insoluble.
thus the net reaction is:
Ag+ + Cl- ---------------> AgCl
thus a percipitate of white AgCl is seen. AgNO3 is a common reagent to detect Cl-,Br-,I- ions.
Hg2++ + 2NO3-- + 2K+ + 2I- -------> 2K+ + 2I- + Hg2I2
Thus the percipitate is yellow Hg2I2. (Mercury(I)ion is Hg2++ not Hg +)
Ca++ + 2NO3- + 2Li+ + CO3-- ------> 2Li+ +2NO3- + CaCO3
Thus the percipitate is of white calcium carbonate
Ba++ + 2NO3- + 2Na+ + SO4-- --------> 2Na+ + 2NO3- + BaSO4
Thus the percipitate is of white barium sulphate.
Posted by biditism on January 15, 2013 at 10:43 AM (Answer #2)
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