Multiple Choice
A low-pressure gas discharge tube emits which of the following?
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6. Chemical Quantities & Aqueous Reactions
Gas Evolution Equations
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Predict the products formed from the following gas evolution equation.
CaS (aq) + HNO3 (aq) →
A
CaS (aq) + 2 HNO3 (aq) → Ca(NO3)2 (aq) + 2 H2S (g)
B
CaS (aq) + HNO3 (aq) → CaNO3 (aq) + H2S (g)
C
CaS (aq) + 2 HNO3 (aq) → Ca(NO3)2 (aq) + H2S (g)
D
No reaction
Verified step by step guidance1
Identify the reactants in the given chemical equation: calcium sulfide (CaS) and nitric acid (HNO3).
Determine the possible products by considering the typical reactions of the reactants. Calcium sulfide can react with acids to produce hydrogen sulfide (H2S) gas and a salt.
Write the balanced chemical equation for the reaction. Calcium sulfide reacts with nitric acid to form calcium nitrate (Ca(NO3)2) and hydrogen sulfide gas (H2S).
Balance the chemical equation by ensuring that the number of atoms of each element is the same on both sides of the equation. This involves adjusting the coefficients of the reactants and products.
Verify the balanced equation: CaS (aq) + 2 HNO3 (aq) → Ca(NO3)2 (aq) + H2S (g). Ensure that the equation is consistent with the law of conservation of mass.
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