April 20, 2014

Homework Help: Chemistry - Balancing Equations

Posted by Akira on Monday, April 19, 2010 at 1:16am.

Balance the following:
Ca(OH) + H2SO4 -----> CaSO4 + H2O
Na2S2O3 + I2 -----> 2NaI + Na2S4O6
ZnCl + Na2S -----> ZnS + NaCl
SnCl4 + H2O ----> SiO2 + 4HCl

I figured out the 2nd and 4th one to be:
2Na2S2O3 + I2 -----> 2NaI + Na2S4O6
SnCl4 + 2H2O -----> SiO2 + 4HCl *Is there a typo in this one with Sn or Si? It was given like this on the handout.

Molecular Equation: Pb(NO3)2 + 2NaBr -----> PbBr2 + 2NaNO3
Ionic Equation: Pb+2 + (NO3)-1 + 2Na+1 + 2Br-1 -----> PbBr2 + 2Na+1 +2(NO3)-1
Net Ionic Equation: Pb+2 + 2Br-1 -----> PbBr2

Molecular Equation: Na2CO3 + MgBr2 -----> 2NaBr + MgCO3
Ionic Equation: 2Na+1 + (CO3)-2 + Mg+2 + 2Br-1 -----> 2NaBr + Mg+2 + (CO3)-2
Net Ionic Equation: 2Na+1 + 2Br-1 -----> 2NaBr

What are the phase labels on the molecular equation and did I choose the correct compound to keep together? Would the phase labels be (Aq) for each one and then (S) for the one staying together?

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