We did a lab where an unknown solution was added to three test tubes. Each test

Question

We did a lab where an unknown solution was added to three test tubes. Each test tube contained the following:

Tube 1:

2 ml unknown

10 ml water

5 drops 4.5% acetic acid C2H4O2

1/2 tsp. sodium bicarbonate NaHCO3

Reaction: bubbles

Tube 2:

2 ml unknown

1 ml water

1 tsp. epsom salt MgSO4

1 drop 4.5% acetic acid C2H4O2

2 ml 0.1 M barium chloride BaCl2

Reaction: white precipitate

Tube 3:

2 ml uknown

2 ml 0.1 M zinc acetate (Zn(C2H3O2)2

2 ml 0.1 M sodium phosphate tribasic Na3PO4

Reaction: milky, thick white precipitate

Question: Based on the reactions, is the unknown solution magnesium sulfate, calcium carbonate, phosphoric acid, nitric acid, or sodium hydroxide?

Question: My unknown contained the following ions:

Thank you in advace...I think it's calcium carbonate but not sure...and i don't have a clue on the ions question

Explanation / Answer

Calcium Carbonate....u can also test th following...for calcium..

calcium carbonate is insoluble in ammonium hydroxide gets dissolved in dil. acetic acid

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