Question

Using the "unit conversion method", derive an equation to calculate the heat produced from the HCl-NaOH reaction

Answer 1

heat produced for the reaction is given by this equation

Answer 2

To calculate the heat produced from the HCl-NaOH reaction, we can use the following equation:

Heat produced = moles of limiting reactant × ΔH of reaction

The "unit conversion method" involves converting the given quantities into moles and then using the stoichiometric coefficients from the balanced chemical equation to determine the moles of the limiting reactant.

Let's assume we have the balanced chemical equation:

HCl + NaOH → NaCl + H2O

Now, let's derive the equation step by step:

1. Convert the given quantities of reactants into moles.

• Convert the mass of HCl to moles: Moles of HCl = Mass of HCl / Molar mass of HCl

• Convert the volume of NaOH to moles (if a solution is provided): Moles of NaOH = Volume of NaOH (in liters) × Molarity of NaOH

2. Determine the limiting reactant. Compare the moles of HCl and NaOH calculated in step 1 using the stoichiometric coefficients from the balanced chemical equation. The reactant with fewer moles is the limiting reactant.

3. Determine the moles of the other reactant that react with the limiting reactant based on the stoichiometry of the balanced chemical equation.

4. Calculate the heat produced using the equation: Heat produced = Moles of limiting reactant × ΔH of reaction

The value of ΔH of reaction represents the enthalpy change associated with the reaction, which can be positive (endothermic) or negative (exothermic).

It's important to note that the specific values of molar masses, volumes, molarity, and ΔH of reaction will depend on the particular reaction being considered.