Question

Balance the following reactions then tell which are metathesis( double replacement) reactions: A) CaCO3 + 2HNO3>Ca( NO3)2 +CO2+H2O
B)BaCl2+ Na2SO4 >BaSO4+NaCl
C)pb(NO3)2 +HCL>pbCl2+HNO3
D)AgNO3 +Zn>Zn(NO3)2 +Ag

Write net ionic equations for a, b,and d in Q. 1 above.

A solution was prepared by dissolving 1.564g of NaCl and 2.765g of KCl in some water and diluting to exactly 250ml in a graduated flask. What is the molarity of Na+, K+ and Cl- ions in the solution.

4) Suppose you have a solution that might contain Al3+, Ca2+, Ag+, and Zn2+ ions. Addition of HCl gave a white precipitate. After filtering off the precipitate, potassium sulfate was added to the filtrate resulting in a white precipitate, which was again filtered off. When a large amount of KOH was added to the filtrate , no precipitate was formed. Which cations are present in the solution?

Answer 1

balance:

A) CaCO3 + 2HNO3>Ca( NO3)2 +CO2+H2O

balance Ca

CaCO3 + 2HNO3 > Ca(NO3)2 +CO2+H2O

this is alreay balanced

B) BaCl2+ Na2SO4 >BaSO4+NaCl

Balance Cl and Na

BaCl2+ Na2SO4 >BaSO4+2NaCl

C)pb(NO3)2 +HCL>pbCl2+HNO3

balance Cl

Pb(NO3)2 + 2HCL> PbCl2 + 2HNO3

D) AgNO3 +Zn>Zn(NO3)2 +Ag

balance NO3

2AgNO3 +Zn>Zn(NO3)2 + 2Ag

now, net ionic:

a)

CaCO3 + 2H+ = Ca+2 + CO2 + H2O

b)

Ba+2 + SO4-2 = BaSO4

c)

Pb+2 +2Cl- = PbCl2

d)

2Ag+ + Zn(s) = Zn+2 + 2Ag(s)