Question

In: Chemistry

Hello! Are these reactions that I did in lab are exothermic or endothermic? Thank you! NaHSO3(sodium...

Hello! Are these reactions that I did in lab are exothermic or endothermic? Thank you!

NaHSO3(sodium bisulfite) over flame reaction. The blue litmus paper on testube turned purple and sodium bisulfite changed color.

Alka-Seltzer over flame reaction. Effervescent reaction. Blue litmus paper turned purple and the alka seltzer changed color.

Mg and HCl mixed together. Effervescent reaction.

NH4NO3(s) and H2O mixed together. Temperature dropped.

CaCl2 and H2O mixed together. Temperture increase.

CuSO4 and Fe mixed together. Fe becomes copper color. (precipitate and color change)

CuSO4 and Mg mixed together. Immediate effervescent. Precipitate formed. Color change.

Fe(NO3)3 and NH4OH mixed together. Precipate and color change.

Ca(NO3)2 and Na2CO3 mixed together. Percipitate and color change.

Expert Solution

Answer:

NaHSO₃ Flame reaction:

2NaHSO₃ Na₂SO₃ + SO₂ + H₂O

SO₂ gas is the Acidic in nature. Hence it turns the Blue litimus in to purple.

Alka-Seltzer:

It is the Acidic nature compound. In the presence of the flame It produces the CO2 and carbonic acid. Hence the blue litmus turns in to purple.

Due to the CO₂ bubbles it is the Effervescent reaction.

Mg + 2HCl MgCl₂ + H₂

Due to the Hydrogen gas the reaction is the Effervescent.

NH₄NO₃ + H₂O NH₄OH + HNO₃

The reaction is the Endothermic reaction. Hence the Temperature is dropped.

CaCl₂ + 2H₂O Ca(OH)₂ + 2HCl

The reaction is the salt to Acid and Base formation. Hence it is the Exothermic reaction. Hence the Temperature increases.

CuSO₄ + Fe FeSO₄ + Cu (ppt)

In the above reaction Cu reduces.

CuSO₄+ Mg MgSO₄ + Cu (ppt)

In the above reaction Cu reduces.

Fe(NO₃)₂ + 2NH₄OH 2NH₄NO₃ (salt) + Fe(OH)₂ (ppt)

Ca(NO₃)₂ + Na₂CO₃ CaCO₃ (salt) + 2NaNO₃ (ppt)

queen_honey_blossom answered 2 years ago

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