Answer Happy

In this experiment, when recording the data needed to determine the enthalpy of reaction between HCI and NaOH it was necessary to measure the pH of the mixture after the reaction had been performed. Why was it necessary to record the pH at this time? Select one: O a. The pH needs to be recorded so that you can determine how the mixture can be disposed of at the end of the experiment (the pH will tell you if the mixture can be poured down the sink or must go in a waste container in the fumecupboard). b. The pH needs to be recorded so that you can determine whether the reactions was properly completed; if the pH is not = 7, you may need to add some more HCI or NaOH and keep recording the temperature to be able to properly calculate the enthalpy of reaction. O c. The pH needs to be recorded so that you can determine if HCl or NaOH is the limiting reaged in the reaction, becuase you need to know which is the limiting reagent in order to calculate the enthalpy of reaction, which has units of J/mol. Od. The pH needs to be recorded so that you can determine whether the reactions was properly completed; if the pH is not = 7 the reaction has not finished yet and you need to keep measuring the temperature over time until the pH does = 7. What is q (heat) for 1.92 g of NaOH(s) dissolving in 101.2 g of 1.00 M HCl(aq) in a calorimeter with a heat capacity of 30.0 J/K. The temperature change is +11.3 °C and the heat capacity of the solution is 4.01 J/K/g. -5012 J -4925 J +5012 J -426 J -126157 J +4673 J -4673 J