I need help to write down initial reaction and ionic equations: here what I did:

Question

I need help to write down initial reaction and ionic equations:

here what I did:

step 1: I Placed 0.1 M K2CrO4 (20 drops) in a clean test-tube. I Added 2 M NaOH (5 drops). then, one drop at a time of 0.1 M Ba(NO3)2 and I noticed that it turned yellow

step 2: To this test-tube I added drop by drop 2 M HNO3 until I noticed a change : it turned orange.

what is the initial reaction and ionic equation? and what is the reaction and ionic equation after adding HNO3?

step 3: I placed 0.1 M K2Cr2O7 (20 drops) in a clean test-tube and Added 2 M HNO3 (5 drops).then I added, a drop at a time, 0.1 M Ba(NO3)2 and I haven't notice any particular change.

step 4: To this test-tube I added, drop by drop, 2 M NaOH and it turned yellow.

what is the initial reaction and ionic equation? and what is the reaction and ionic equation after adding NaOH?

Observation on dropwise addition of: after adding Ba2+ HNO3 NaOH e O ellow oRange steps 1 and 2 sTmuis mono change hange Tube from uellow Tube from Steps 1 and 2. Initial reaction: Ionic equation Reaction after adding HNO3: Ionic equation Tube from Steps 3 and 4. Initial reaction: Ionic equation Reaction after adding NaOH: Ionic equation

Explanation / Answer

step 1 & 2

initial reaction :

K2CrO4 + Ba(NO3)2 ---------------------------> BaCrO4 (s) + 2KNO3

                                                                        (yellow)

ionic reaction :

CrO4-2 (aq) + Ba+2 (aq) -------------------> BaCrO4 (s) (yellow)

reaction after adding HNO3 :

2 BaCrO4 + 2 HNO3 -----------------------> BaCr2O7 (s) + Ba(NO3)2 + H2O

                                                                    (orange)

ionic equation :

2 BaCrO4(s) + 2H+ + 2 NO3- ------------------> Ba+2 + Cr2O7-2 + H2O(l) + Ba+2 + 2NO3-

net ionic equation :

2 BaCrO4(s) + 2H+   ------------------> Ba+2 + (Cr2O7)-2 + H2O (l)

for stpe 3 & 4

initial reaction : K2CrO7 + Ba (NO3)2 ------------------> BaCr2O7 + 2 KNO3

ionic reaction : CrO7 -2 + Ba+2 ---------------------> BaCr2O7

reaction after adding NaOH :

BaCr2O7 + 2 NaOH -------------------> BaCrO4 (s) + Na2CrO4 + H2O

                                                              (yellow)

ionic reaction :

Cr2O7-2 + 2OH- ----------------------> BaCrO4 (s) + CrO4-2 (aq) + H2O (l)

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