Using the provided table of temperature and time, plot a graph of temperature against time and determine the temperature change. Solid A is added at 2 1/2 minutes.

To answer this question, the temperature values for each time interval in Table 1 are required. The provided table is incomplete, as it does not contain any temperature readings.

Therefore, I cannot plot the graph or determine the temperature change without the necessary data.

Here's how you would approach the problem if the data were available:

• a) Plot the graph of temperature against time:

  • The x-axis would represent Time (min) and the y-axis would represent Temperature ($^\circ$c).
  • You would plot the given temperature values against their corresponding time points.
  • The procedure states that solid A is added at $2\frac{1}{2}$ minutes. The graph would typically show an initial stable temperature, followed by a sharp change (increase or decrease) after $2\frac{1}{2}$ minutes as the reaction occurs, and then a gradual return towards room temperature.
  • Draw a smooth curve through the plotted points.

• b) Using the graph determine the temperature change:

  • From the graph, extrapolate the initial temperature of the hydrochloric acid at the time of mixing (e.g., at $2\frac{1}{2}$ minutes, before the reaction fully takes effect, by extending the initial temperature line).
  • Extrapolate the maximum or minimum temperature that would have been reached if no heat was lost to the surroundings (by extending the cooling/heating curve back to the time of mixing).
  • The temperature change, $\Delta T$, would be the difference between this extrapolated maximum/minimum temperature and the initial temperature.

Since the data is missing, a numerical answer cannot be provided.