A student investigated the temperature change during the neutralization reaction of dilute hydrochloric acid (HCl\text{HCl}HCl) and sodium hydroxide (NaOH\text{NaOH}NaOH) solution in a glass beaker.
The student added portions of 4 cm34\text{ cm}^34 cm3 of dilute hydrochloric acid to 20 cm320\text{ cm}^320 cm3 of sodium hydroxide solution and recorded the temperature after each addition. The results are shown in the table below:
| Volume of dilute HCl\text{HCl}HCl added (cm3\text{cm}^3cm3) | Temperature (∘C^\circ\text{C}∘C) |
|---|---|
| 4 | 19.8 |
| 8 | 20.7 |
| 12 | 21.6 |
| 16 | 22.5 |
| 20 | 23.4 |
| 24 | 24.3 |
The recorded temperatures follow a linear relationship.
Name a container the student could use instead of a glass beaker to minimize heat loss to the surroundings and improve the accuracy of the results.
The starting temperature of the sodium hydroxide solution corresponds to the yyy-intercept of the line of best fit (where the volume of acid added is 0 cm30\text{ cm}^30 cm3). Determine this starting temperature in ∘C^\circ\text{C}∘C.