Operații de bază în laborator

What is used for the precise measurement of liquid volumes?

• graduated cylinders, pycnometers, bulb pipettes, burettes

• graduated balloons, graduated pipettes, burettes, bulb pipettes

• thermometers, graduated pipettes, burettes, graduated cylinders

• densimeters, graduated cylinders, Berzelius glasses, Erlenmeyer flasks

Circle A if the statements are true and F if the statements are false.

• Graduated balloons are used for distilling liquid mixtures.

• A graduated cylinder is used for accurately measuring a volume of liquid.

• A pycnometer is a glass vessel used for measuring density.

Match the laboratory vessels from column A with the operation they are used for in column B.

Name two laboratory vessels made of porcelain.

Calculate the density of a liquid, knowing: mass of the empty pycnometer, m1 = 20.5130 g, mass of the pycnometer with distilled water, m2 = 45.5977 g, mass of the pycnometer with the analyzed liquid m3 = 41.7998 g.