I need help with question #3. I already completed #\'s 1 and 2. I am confused as

Question

I need help with question #3. I already completed #'s 1 and 2. I am confused as to what a confirmatory reaction is and how it can be applied to the four balanced equations is problem #2. I am supposed to use the balanced equations in question #2: Mg+2, Ca+2, Ba+2, and Al+3 and create a confirmatory reaction for those reactions. Please and thank you!

1. Wh at ions were present in your unknown. Bat and Mat2 ced equation for each precipitation reaction that was used to separate the four cations. 2. W rite a balanced e Ca 2 +20H B a12 eaction or set of reactions for each of the four cations. 3. Write a balanced equation for the confirmatory reaction or set of reactions for each

Explanation / Answer

3: Conformatory test for Al3+ : Al3+ gives gelatineous white ppt. with 6M NH3 in presence of Al - dye.

Al3+ + 3NH3 + 3H2O ------ > Al(OH)3 (gelatineous white ppt) + 3NH4+

Conformatory test for Ba2+ :

Ba2+ + CrO42- ------ > BaCrO4 (yellow ppt.)

Ba2+ + SO42-  ------ > BaSO4 (white ppt.)

Conformatory test for Ca2+ :

Ca2+ + C2O42- ------ > CaC2O4 (white ppt.)

Conformatory test for Mg2+ :

Mg2+ + (NH4)3PO4 ------ > MgNH4PO4 (white ppt.)

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