I have problems with this question. Can anybody help me?
When dilute nitric acid was added to a solution of one of the following chemicals, a gas was evolved. This gas turned a drop of limewater. Ca(OH)2, cloudy,due to the formation of a white precipitate. The chemical was...
A. NH3
B. NaHCO3
C. NaCl
D. MgSO4x7H20
E. 5% NaOCl
Of course! I'd be happy to help you with this question.
To determine which chemical reacts with dilute nitric acid and produces a gas that turns a drop of limewater cloudy, we need to understand the chemical reactions involved.
Firstly, let's consider the properties of the five given chemicals:
A. NH3 (Ammonia): Ammonia is a gas at room temperature, and it forms a white precipitate with dilute nitric acid. However, it does not produce a gas that turns limewater cloudy.
B. NaHCO3 (Sodium bicarbonate): Sodium bicarbonate is a white solid, and it reacts with acids to produce carbon dioxide gas. Carbon dioxide does not turn limewater cloudy.
C. NaCl (Sodium chloride): Sodium chloride is a common salt, and it does not react significantly with dilute nitric acid. It does not produce a gas that turns limewater cloudy.
D. MgSO4ยท7H2O (Magnesium sulfate heptahydrate): Magnesium sulfate is a white crystalline solid, and it does not react with dilute nitric acid to produce a gas that turns limewater cloudy.
E. 5% NaOCl (Sodium hypochlorite): Sodium hypochlorite is the active ingredient in household bleach. It does not react with dilute nitric acid to produce a gas that turns limewater cloudy.
Based on the given information, the only chemical that could be responsible for the observed reaction is A. NH3 (Ammonia). Although ammonia does not produce a gas that turns limewater cloudy, it forms a white precipitate with dilute nitric acid.
Therefore, the correct answer is A. NH3 (Ammonia).
The classic test for carbon dioxide (CO2) is the lime water test.
Ca(OH)2 + CO2 ==> CaCO3(white solid) + H2O
Which of the five do you think will evolve CO2 gas?