<Dl> <Dd> Black stripped technique </Dd> </Dl> <Dd> Black stripped technique </Dd> <P> The amount of solution added in or drained out needed to be read correctly by observing at eye level straight to the bottom of "Meniscus" for most solutions . Before reading the data, the bubbles must all been removed from the Burette otherwise the data will be inaccurately measured . Also, reading the data at the eye level means looking straight at the bottom of the meniscus . The initial and final volumes collected will be calculated for the difference in volume which equal to the total volume of solution drained out of the Burette . The difference in volume can be calculated by taking the difference of final volume and initial volume Using the Burette with a colorless solution is sometimes difficult to observe the bottom of the meniscus so Black Strip Technique can help to accurately observe and measure the number on the scale . Moreover, the number should be reported in two decimal places, which can be done more easily by using the Black strip Technique . The black strip can be written with pen on the normal white paper or it can be printed it out . However, it is necessary to use white color paper as the background, in order to make the scale readable . </P> <P> Specification or product specification is used as an identification of volumetric burette for example nominal volume, volume unit, error limit, accuracy class of the burette and manufacture's related details . Specification is directly association with the usage of each laboratory equipment including burette . Therefore, it is necessary to be able to understand each of specification in details in order to perform the accurate experiment . Nominal volume, error and units are the basic knowledge in order to distinguish the amount of solution delivered from the burette in unit of ml or cm . Another specification for burette is called calibration marked as TD or Ex stand for "Calibration to Deliver". It indicates that this burette is better used to delivery purpose which the amount will be correspond to the volume as specified The accuracy classes of equipment also shown in the specification of burette as well and it includes class A and class B. Class A is more preferred than Class B when volumetric accuracy is important for the accuracy of the experiment with accuracy up to 0.1 percent compared to 0.2 percent in Class B burette . </P>

To how many decimal places should the volume of a liquid in a burette be recorded