What is the biggest source of error in the enthalpy of neutralization measurements performed in this experiment?
What is the biggest source of error in the enthalpy of neutralization measurements performed in this experiment?
The largest source of error in this experiment was the gross imprecision of the measuring instruments. Exactly 50.0 mL of solutions should have been used, as many derivative calculations depend on that amount being precise.
Is Hess law accurate?
If a procedure is written as the sum of many stepwise methods, the total process’s enthalpy change is equal to the sum of the different steps’ enthalpy changes. The law of Hess is true since enthalpy is a part of the state.
What is the purpose of Hess law in laboratory?
Hess’s Law states that when two or more reactions can be added together to give a net chemical reaction, the energy associated with each of the reactions can also be added together to give the net enthalpy (ΔH) change. The law can be used to obtain thermodynamic data that cannot be measured directly.
Does this experimental process support Hess’s Law Why or why not suggest ways of improving your results?
Explanation: Yes, this experimental process supports Hess’s Law. The enthalpy of reactions 1 and 2 add up to the calculated enthalpy for reaction 3, even though it’s not the same as the accepted value. If the experiment takes place in a closed system or in lab, then no heat would be released into the surroundings.
How could you determine if an enthalpy change was occurring in the lab?
Utilizing a thermometer to measure the temperature change of the solution, (along with the mass of the solute) to determine the enthalpy change for an aqueous solution, as long as the reaction is carried out in a calorimeter or similar apparatus . You can use a coffee cup calorimeter.
What is the effect of acid strength on the enthalpy of neutralization?
The weaker the acid, the more endothermic, and thus lower enthalpy change of neutralization.
Does Hess’s law work?
Hess’s law is due to enthalpy being a state function, which allows us to calculate the overall change in enthalpy by simply summing up the changes for each step of the way, until product is formed. All steps have to proceed at the same temperature and the equations for the individual steps must balance out.
Why does Hess’s law hold true?
Hess’s law is attributable to enthalpy being a state function, which helps one to quantify the total shift in enthalpy by simply summing up the changes for each step of the way, before the product is created.
How do I verify Hess law?
Finally, to verify Hess’s Law, you will use the H’s you measured for the first two reactions to calculate H for the third reaction. Compare it to what you measured for the third reaction by calculating the Percent Error.