What are the symbols and charges of the group 4 cations? Is this correct? Group

Question

What are the symbols and charges of the group 4 cations?

Is this correct?    Group IV: Ba2+, Ca2+, K+, Mg2+, Na+, NH4+
  Ba2+, Ca2+, and Mg2+ are precipitated in 0.2 M (NH4)2CO3 solution at pH 10; the other ions are soluble

What color do the following ions impart to a flame?  Please tell me if correct for colors I listed?

Ba2+            green

Ca2+            orange/red

Na+              yellow

complete and balance the following equation:  Need help with this.

(a) Ba^2+(aq)+CrO4^2-(aq)          (4 is subscript)

(b) NH4^+(aq)+OH^-                     (4 is subscript)

Explanation / Answer

(1) symbols and charges are correct

(2) fiame test colors are perfect.

(3) a. Ba2(aq) + (CrO4)2(aq) = Ba2(CrO4)2(s)

b. NH4+ (aq) + OH- (aq) = H2O (l) + NH3 (aq)

NH4+ = acid
OH- = Base
NH3 = conjugate base
H2O = conjugate acid

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