Measuring liquids Precise measurements and accurate readings are very important aspects of scientific experimentations. Your task: Complete the following questions a) Number the steps for accurately measuring the volume of a liquid. Make sure the container measurement is read at eye level Read the level at the bottom of the meniscus. Ignore the curved edge and measure from the flat surface of the water Place measuring cylinder on a flat level surface. b) State the volume of liquid in each measuring cylinder show in the diagram below. Your measurements should be in millimetres (mL). Volume of liquid in measuring cylinder A = Volume of liquid in measuring cylinder B = Volume of liquid in measuring cylinder C = Practical part A- Using measuring cylinder to measure liquid volume Overview: Measuring the volume of liquids with a measuring cylinder is a basic skill needed for many science classes. Accuracy is a very important part of the measurement process. Being off just a few Purpose: To develop skills for measuring liquids with a measuring cylinder. Equipment per group: 1 beaker with water and red food colouring (~30ml) 1 beaker with water and yellow food colouring (~30ml) 1 beaker with water and blue food colouring (~30 ml) 1x measuring cylinder (25 ml) 6 x small test tubes 1x test tube rack Method: (READ CAREFULY) 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Line up and/or label your test tubes in a row from A to F (A, B, C, D, E, F) in the test tube rack. Measure 18mL of red water in the measuring cylinder and transfer into test tube A. Measure 18mL of yellow water in the measuring cylinder and transfer into test tube C. Measure 18mL of blue water in the measuring cylinder and transfer into test tube E. From test tube C, measure 4mL of liquid and transfer into test tube D. From test tube E, measure 7mL in the measuring cylinder and transfer into test tube D. Swirl the test tube to mix. From the beaker of blue water, measure 4mL in the measuring cylinder and transfer into test tube F. From the beaker of red water, measure 7mL in the measuring cylinder and transfer into test tube F. Swirl the test tube to mix. From test tube A, measure 8mL of liquid, and transfer into test tube B. From test tube C, measure 8mL of liquid and transfer into test tube B. Swirl test tube B to mix. Data table and observation: Test tube Final colour of water Final total amount of water (mL) A B C D E F Questions and conclusions: a) What do you think happened during the practical that may have caused you measurements to not be exact? b) What could you do to increase the accuracy of your measuring?
