Question

The following reactions worked: Pb(NO3)2 + KI, BaCl2 + Na2SO4 , NaOH + HCl , and...

The following reactions worked:

Pb(NO3)2 + KI, BaCl2 + Na2SO4 , NaOH + HCl , and NaHCO3 + HCl.

The following did not work:

HCl + Na2SO4 and KCl + Na2SO4.

Please classify into precipitation, neutralization, or gas-producing.

Why do some work and the others don't?

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Answer #1

pb(NO3)2 + KI ----------> PBI2      + KNO3      precipitation reaction

BaCl2 + Na2SO4 --------------> BaSO4      +   2NaCl        precipitation reaction

NaOH + HCl ------------------> H2O   + naCl    neutralization reaction

NaHCO3 + HCl   ----------------->   NaCl    + H2O   + CO2      gas producing    and neutralization reaction.

reaction between two strong electrolytes are not possible.  

reaction between one strong electrolyte and one weak electrolyte are possible.

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