In this experiment you will determine the enthalpy change, $$\(\Delta H_{r}\)$$, for the reaction shown. $$\[ \mathrm{NaOH}(\mathrm{aq})+\mathrm{CO}_{2}(\mathrm{~g}) \rightarrow \mathrm{NaHCO}_{3}(\mathrm{aq}) \quad \text { enthalpy change }=\Delta H_{\mathrm{r}} \]$$ You will react each of sodium hydroxide and sodium hydrogencarbonate with excess dilute sulfuric acid. You will determine the enthalpy change for each reaction, then use Hess's law to calculate $$\(\Delta H_{r}\)$$. Reaction of sodium hydroxide with sulfuric acid $$\[ 2 \mathrm{NaOH}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{SO}_{4}(\mathrm{aq}) \rightarrow \mathrm{Na}_{2} \mathrm{SO}_{4}(\mathrm{aq})+2 \mathrm{H}_{2} \mathrm{O}(\mathrm{I}) \quad \text { enthalpy change }=\Delta H_{1} \]$$ FA 1 is $$\(2.00 \mathrm{~mol} \mathrm{dm}^{-3}\)$$ sodium hydroxide, NaOH . FA 2 is $$\(2.00 \mathrm{~mol} \mathrm{dm}^{-3}\)$$ sulfuric acid, $$\(\mathrm{H}_{2} \mathrm{SO}_{4}\)$$. Method - Support a cup in the $$\(250 \mathrm{~cm}^{3}\)$$ beaker. - Use the $$\(50 \mathrm{~cm}^{3}\)$$ measuring cylinder to transfer $$\(30.0 \mathrm{~cm}^{3}\)$$ of FA 1 into the cup. - Place the thermometer in FA 1 and tilt the cup, if necessary, so that the bulb of the thermometer is fully covered. Record the temperature of FA 1. - Use the $$\(25 \mathrm{~cm}^{3}\)$$ measuring cylinder to add $$\(20.0 \mathrm{~cm}^{3}\)$$ of FA 2 to the FA 1 in the cup. - Stir the mixture. - Measure and record the maximum temperature reached. - Calculate and record the change in temperature. Results

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