Experimental Design：练习题

Which piece of laboratory apparatus is most appropriate for measuring exactly \(25.0 \text{ cm}^3\) of aqueous sodium hydroxide during a titration experiment?

A student needs to measure the volume of a gas evolved in a chemical reaction over a period of 5 minutes. Which combination of apparatus is the most suitable for measuring the rate of this reaction?

To identify the components of a colourless liquid mixture using paper chromatography, a locating agent is required. What is the primary reason for using a locating agent in this context?

Which apparatus is specifically designed to measure variable volumes of gas evolved during a chemical reaction?

A sample of gas is known to be acidic and needs to be dried before collection by downward delivery. Which drying agent is suitable for this purpose, and which gas could it be?

A student needs to dry a sample of hydrogen gas before collection. Which of the following substances listed in the syllabus can be used as a drying agent?

Name the most appropriate piece of laboratory apparatus used to measure precisely \(25.0 \text{ cm}^3\) of hydrochloric acid during a titration.