Posted by Anonymous on Friday, December 3, 2010 at 1:35am.
I will show you how to do one and then you can have a go at the others. First decide if the mixture will give you a reaction, a precipitate. If there is no reaction there is neither a molecular equation or a net ionic equation.
Start with the molecular formula
Na2CrO4(aq) + Sr(NO3)2(aq) -> NaNO3(aq) + SrCrO4(s)
balance the equation
Na2CrO4(aq) + Sr(NO3)2(aq) -> 2NaNO3(aq) + SrCrO4(s)
write in all the ions
2Na+(aq) + CrO4^2-(aq) + Sr^2(aq)+2NO3-(aq)->
2Na2+(aq)+ 2NO3-(aq) + SrCrO4(s)
now you delete ions that appear on each side, so you end up with
CrO4^2-(aq) + Sr^2(aq)->
SrCrO4(s)
which is the net ionic equation.
Mgcl+k2SO4
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