Write a molecular equation for the gas-evolution reaction that occurs when you mix aqueous hydrobromic acid and aqueous potassium sulfide.
2 HI + Li2S2O4 �¨ H2S2O4 + 2 LiI
this is what I got and it says I'm wrong? I don't understand why
To write a molecular equation for the gas-evolution reaction between aqueous hydrobromic acid (HBr) and aqueous potassium sulfide (K2S), we need to determine the products formed.
Hydrobromic acid (HBr) is a strong acid, while potassium sulfide (K2S) is a salt that dissociates in water. When an acid reacts with a salt, it typically forms a new salt and releases a gas.
The chemical equation for the reaction can be written as:
HBr(aq) + K2S(aq) → KBr(aq) + H2S(g)
Note that H2S is the gas formed in this reaction. The aqueous potassium sulfide dissociates into K+ ions and S2- ions, and the H+ ions from hydrobromic acid react with the S2- ions to form H2S gas. The potassium ions, K+, combine with the bromide ions, Br-, from hydrobromic acid to form potassium bromide, KBr.
Therefore, the molecular equation for the gas-evolution reaction is:
HBr(aq) + K2S(aq) → KBr(aq) + H2S(g)
To write a molecular equation for the gas-evolution reaction between hydrobromic acid (HBr) and potassium sulfide (K2S), we need to consider the products formed when these two compounds react.
First, we need to determine the chemical formulas of the products formed. Hydrobromic acid dissociates in water to give H+ and Br- ions. Potassium sulfide, on the other hand, dissociates to yield K+ and S2- ions.
When these ions combine, they form potassium bromide (KBr) and hydrogen sulfide (H2S). The balanced molecular equation for the gas-evolution reaction can be written as follows:
2HBr(aq) + K2S(aq) → 2KBr(aq) + H2S(g)
In this equation, (aq) represents aqueous solutions, and (g) represents a gaseous product.