The diagrams show four pieces of laboratory equipment.

During an experiment a measurement is recorded in cm³ . Which apparatus is used?

25 cm³ of an alkali are added to 20 cm³ of an acid. The temperature change is measured. Which apparatus is not needed in the experiment?

A student put 25.0 cm³ of dilute hydrochloric acid into a conical flask. The student added 2.5 g of solid sodium carbonate and measured the change in temperature of the mixture. Which apparatus does the student need to use to obtain the most accurate results?

A student mixes 25cm³ samples of dilute hydrochloric acid with different volumes of aqueous sodium hydroxide. In each case, the student measures the change in temperature to test if the reaction is exothermic. Which piece of apparatus is not needed?