Question

Write proper net ionic equations (sans spectator ions, including proper charges and phases for reacting ions) for the following:
a. Aqueous lead (II) nitrate is mixed with aqueous sodium carbonate.
b. Aqueous barium chloride is mixed with Aqueous silver acetate
c. Aqueous copper (I) nitrate is mixed with Aqueous sodium phosphate
d. Solid potassium bromide is added to an Aqueous HCL solution.
Explanations please. I really don't understand.

Answer 1

i'll do a) Lead (II) nitrate is mixed with aqueous sodium carbonate.

Start by writing the formulas with the symbols and their charges

Lead is 2+ because is says on the roman numeral

\(Pb^{2+}\)

Nitrate is a polyatomic ion with a -1 charge (something you have to memorize)

\(NO_3^-\)

Sodium is always 1+ (you need 2 of these to balance the charge with carbonate)

Carbonate is another polyatomic ion you have to memorize

\(CO_3^{2-}\)

This is the equation:

\(\sf Pb(NO_3)_2+Na_2CO_3\rightarrow PbCO_3+2NaNO_3\)

Lead carbonate is pretty insoluble (again, something you have to memorize or look up), sodium nitrate is very soluble.

So the net equation is:

\(\large \sf Pb^{2+}+CO_3^{2-}\rightarrow PbCO_{3~(s)}\)

Answer 2

Polyatomic ions:

http://www.chemistry.wustl.edu/~edudev/LabTutorials/PeriodicProperties/Ions/ions.html

Solubility table:

http://www.chemteam.info/Equations/Solubility-Table.html