Question

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Answer 1

Hi first of all you have not provided 3 columns information to me (Ba(NO₃)₂ + HNO₃), (AgNO₃), & (AgNO₃ + HNO₃)

1. With HNO₃ - bubbles of CO₂ gas which is appeared as yellowish due to dissolved brownish NO₂ gas in HNO₃ (NO₂ formed by auto-oxidation of HNO₃ on long stand), anyway bubbles popping up is a strong indication of carbonates and bicarbonates only.

Na₂CO₃ (aq) + 2 HNO₃ (aq) ==> 2 NaNO₃ (aq) + CO₂ (g) + H₂O (l)

2. Thymol blue changes it color appearance to dark purple (dark blue color) in basic solutions as Na₂CO₃ is a salt of strong base NaOH & weak acid H₂CO₃. It gives basic hydroxyl ions [OH^-] on hydrolysis.

CO₃^2- (aq) + H₂O (l) <==> HCO₃^- (aq) + OH^- (aq)

pH Indicator Chart Acidic Indicator pH Range T o bi to u na 10 Basic 13 14 11 12 Thymol Blue 1.2-2.8 and 8.0-9.2 Methyl Orange 3.0-4.4 Bromphenol Blue 3.0-4.6 Congo Red 3.0-5.0 Bromcresol Green 3.8-5.4 Methyl Red 4,4-62 Bromthymol Blue 60-7.6 Phenol Red 6.8-8.4

3. Thick white precipitate [BaCO₃] forms when we add barium ions to a carbonate solution.

Na₂CO₃ (aq) + Ba(NO₃)₂ (aq) ==> BaCO₃ (s) + 2NaNO₃ (aq)

Answer: -----------   Your unknown is Na₂CO₃

Hope this helped you!

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