Take LiCl on the tip of a scoopula, add 2-3 mL of concentrated NH3 (aq) and then
ID: 481819 • Letter: T
Question
Take LiCl on the tip of a scoopula, add 2-3 mL of concentrated NH3 (aq) and then a few crystals of NH4F. Carry out the same reaction for KCl and MgCl2. Compare and explain the results. Write ionic equation (s) when the reaction(s) occur (s).
a) compare the solubility of corresponding Li and K compounds;
b) do not include NH3 into the equations: the role of NH3 is to create a basic medium according to the equation: NH3 + H2O NH4+ +OH
LiCl and NH4F did not fully mix together, there was still precipitate at bottom of test tube
KCl and NH4F did fully mix and disolve - no precipitate
MgCl2 and NH4F still left precipitate
help with net ionic equations
Explanation / Answer
LiCl(s) + NH4F(aq) ----> LiF(s) + NH4Cl(aq)
Net ionic equation:
Li+(aq) + F-(aq) -----> LiF(s)
Potaissum salts are soluble in aqeuous solution
KCl(aq) + NH4F(aq) ------> KF(aq) + NH4Cl(aq)
No netionic equation
--------------------------------------------------------
MgCl2(aq) + 2NH4F(aq) ---> MgF2(s) + 2NH4Cl(aq)
Net ionic equation:
Mg2+(aq) + F-(aq) --> MgF2(s)
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