To a solution of 500 mL of KOII is added 50 mL of 2 M IICl and the mixture is well shaken. The

step 1 To a solution of 500m .m. of potassium hydroxide is added 50ml of 2 molar hydrochloric acid and

To a solution of 500 mL of KOII is added 50 mL of 2 M IICl...

To a solution of $500 \mathrm{~mL}$ of $\mathrm{KOII}$ is added $50 \mathrm{~mL}$ of $2 \mathrm{M}$ IICl and the mixture is well shaken. The risc in tempcrature $T_{1}$ is noted. The cxperiment is then repcated using $250 \mathrm{~mL}$ of cach solution and rise in temperature $T_{2}$ is again noted. $\Lambda$ ssume all heat is taken up by the solution. Now, which of the following is correct? (1) $T_{1}=T_{2}$. (2) $T_{1}$ is twice as larger as $T_{2}$. (3) $T_{2}$ is twice as larger as $T_{1}$. (4) $T_{1}$ is 4 times as larger as $T_{2}$.

To a solution of $500 \mathrm{~mL}$ of $\mathrm{KOII}$ is added $50 \mathrm{~mL}$ of $2 \mathrm{M}$ IICl and the mixture is well shaken. The risc in tempcrature $T_{1}$ is noted. The cxperiment is then repcated using $250 \mathrm{~mL}$ of cach solution and rise in temperature $T_{2}$ is again noted. $\Lambda$ ssume all heat is taken up by the solution. Now, which of the following is correct?
(1) $T_{1}=T_{2}$.
(2) $T_{1}$ is twice as larger as $T_{2}$.
(3) $T_{2}$ is twice as larger as $T_{1}$.
(4) $T_{1}$ is 4 times as larger as $T_{2}$.

Key Concepts

Calorimetry

Calorimetry is the study of measuring the amount of heat released or absorbed during a chemical reaction or physical process. It typically involves quantifying the change in temperature of a surrounding substance, like a solution, based on its mass and specific heat capacity. This concept is crucial for understanding how energy is transferred in chemical reactions and for calculating the enthalpy changes involved.

Energy Conservation in Chemical Reactions

This concept is based on the principle that energy is neither created nor destroyed but merely transformed. In an exothermic or endothermic reaction, the energy released or absorbed by the reaction is completely taken up by the system (in this case, the solution). Understanding energy conservation helps in establishing the proportionality between the energy released per mole of reactant and the resultant temperature change when accounted for the mass and specific heat capacity of the solution.

Scaling Laws in Reaction Systems

Scaling laws involve understanding how changes in the quantities of reactants and the volumes of the solutions affect the overall energy change and resulting temperature change of the system. When both the amount of reactant (which determines the heat released) and the solution mass (which determines how much that heat is diluted) are scaled equally, the resulting temperature change remains constant. This principle is central to predicting outcomes when the sizes of experiments are changed proportionally.

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