Initial Temperature Determination from Calorimetry Plot
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Consider the temperature plot from a calorimetry experiment.
What is the initial temperature $(^\circ\text{C})$ of the solution?
This question includes visual content: A scatter plot with temperature in degrees Celsius on the y-axis (range 20 to 50) and time in seconds on the x-axis (range -120 to 600). There are two initial data points at time $t < 0$ (around $-60$ and $-30$ s) showing a temperature of approximately $23^\circ$C. At $t = 30$ s, the temperature jumps to approximately $43^\circ$C and then gradually decreases linearly. A red best-fit line is drawn through the cooling phase (from $t = 30$ to $t = 330$), which if extrapolated back to $t = 0$ (the mixing time), would indicate the initial temperature of the solution after the reaction.
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In this metallurgy experiment, we're asked to find the initial temperature of the solution from a given temperature plot.
Calorimetry: Initial Temperature Analysis
Let's take a closer look at the data points on our graph. The y-axis represents temperature in degrees Celsius, and the x-axis represents time in seconds.
Initial temperature refers to the temperature of the contents before the reaction or mixing event occurs, which is usually at the very beginning of the timeline shown.
Looking at the bottom left of the graph, we see two data points recorded before time zero, specifically at negative sixty seconds and shortly after.
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