The finger used to control the delivery of liquid from a pipet is the... What sh
ID: 947925 • Letter: T
Question
The finger used to control the delivery of liquid from a pipet is the... What should be done with the last bit of liquid remaining in the pipet after delivery? Most pipets are calibrated as TD 20DegreeC. Define TD: what is its meaning regarding the volume of liquid a pipet delivers? Experimental Procedure, Part C.1 The density of a diamond is 3.51 g/cm^3, and the density of platinum is 21.43 g/cm^3. If equal masses of diamond and platinum are transferred to equal volumes of water in separate graduated cylinders. Which graduated cylinder would have the greatest volume change? Explain or show with a sample calculation. Experimental Procedure, Part C.3 The mass of a beaker is 5.333 g. After 5.00 mL of a concentrated hydrochloric acid solution is pipette into the beaker, the combined mass of the beaker and the hydrochloric acid sample is 11.229 g. From the data, what is the measured density of the hydrochloric acid solution?Explanation / Answer
6a. Remove the drop suspended from a pipet tip by toching it to tha wall of beaker
6b. The finger used to control the delivery of liquid from pipet is the index finger
6c. Do not blow this drop out touch it to the inside wall of the flask and then gently given a half-twist.
6d. meanign of TD is to deliver
Volumetric pipettes labeled TD are designed to deliver the volume stated on the pipette
7. Density = Mass/Volume
Volume is inversly proportional to density. If density is more the volume occupied by unit mass is less
density of diamond is 3.51 g/cm3 and platinum is 21.43 g/cm3
If we take equal masses of diamond and platinum, diamond occupies more volume than platinum due to its less density compared with platinum
Graduated cylinder with diamond would have the greatest volume change
8. mass of hydrochloric acid = combined mass of beaker and hydrochloric acid - mass of beaker
= 11.299 - 5.333
= 5.966 g
Density of hydrochloric acid = mass of hydrochloric acid/volume of hydrochloric acid
= 5.966/5
= 1.193 g/cm3
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