A gas generator is constructed to collect the CO2(g) evolved from a reaction.
during lab we set up the CO2 generator by placing 10ml of 3 M HCL in a 200mm test tube. then slide the 75mm test tube into the 200mm test tube without splashing any of the acid into the sample. The HCl is in the 200mm test tube and separately the CaCO3 sample which is in the 75mm test tube is inserted. Then the generator is gently agitate to allow some of the HCL solution to contact the sample mixture. As the evolution rate of CO2(g) decreases, the generator is agitate again and again until the CO2(g) is no longer evolved. Suppose 6 M HCL is substituted for the 3 M HCl in the procedure. What would be the consequence of this substitution? Explain
It will take 1/2 the amount of HCl if the concn is doubled from 3M to 6M.
The substitution of 6 M HCl for the 3 M HCl in the procedure would have several consequences:
1. Reaction Rate: The reaction between 6 M HCl and the CaCO3 sample would proceed at a faster rate compared to the reaction between 3 M HCl and the CaCO3 sample. This is because the concentration of HCl in the solution is doubled, which increases the number of HCl molecules available for a collision with the CaCO3. The increased reaction rate would result in a higher and faster evolution of CO2 gas.
2. Quantity of CO2 Evolved: Since the reaction rate is increased, more CO2 gas would be evolved in a given period of time using the 6 M HCl solution compared to the 3 M HCl solution. This means that a larger volume of CO2 gas would be collected during the experiment.
3. Rate of Decrease in CO2 Evolution: As the reaction progresses, the rate of CO2 evolution would gradually decrease regardless of the concentration of HCl. However, with the 6 M HCl solution, the reaction rate would be faster initially, which means the rate of decrease in CO2 evolution would also be faster. This implies that the time taken for the reaction to reach completion, where no more CO2 gas is evolved, would be shorter with the 6 M HCl solution.
It's worth noting that the concentration of HCl can affect the reaction rate, but other factors such as temperature and the physical properties of the reactants can also play a role. To get a more complete understanding and accurate prediction, factors such as temperature and the specific reaction rate constants would need to be considered.