ad and dis of lab appratus

Question 1

Temperature probe versus thermometer

Answer 1

advantages of
the temperature probe…
* More precise readings
*Can easily take multiple repeat readings
*Can use automatic sampling over Longer periods of time

Disadvantages
*Probe can be corroded by some reagents
*Probes are more expensive to replace

Question 2

Volumetric pipette versus a measuring cylinder

Answer 2

Advantages
*Pipette measures very accurately

Disadvantages
* Harder to use and only measures one fixed volume

Question 3

Gas syringe versus Inverted cylinder for collecting gases

Answer 3

Advantages
* Gas syringes are easy to set up and keep the gas dry

Disadvantages
* The pistons can stick
* Limited volume can be collected
* Delicate and expensive

Question 4

Mircroscale versus normal scale quantities

Answer 4

Advantages
* Less wasteful of reagents
* Saves energy
* Safer

Disadvantages
* Hard to see what’s happening
*Lose a lot of material in separating and purifying products

Question 5

Stopwatches

Answer 5

Measurement of time

Question 6

Thermometers

Answer 6

measurement of temperature
Digital temperature probes are available which are more precise than traditional thermometers

Question 7

Balance

Answer 7

Measuring mass

Question 8

The volume of a liquid can be determined using several types of apparatus, depending on the level of accuracy needed like-

Answer 8

• Burette
• Pipette
• Measuring Cylinder

Question 9

For approximate volumes where high accuracy is not an important factor, we use

Answer 9

measuring ( or graduated) cylinders are used
it is easy to use and faster

Question 10

__________ _______ are the most accurate way of measuring a ____ volume of liquid,

Answer 10

Volumetric pipettes are the most accurate way of measuring a fixed volume of liquid,

Question 11

Burettes

Answer 11

• Burettes are the most accurate way of measuring a variable volume of liquid between 0 cm3 and 50 cm3
• The tricky thing with burettes is to remember to read the scale from top to bottom as 0.00 cm3 is at the top of the column

Stand and clamp for holding it

Question 12

Gas syringe

Answer 12

Collecting and measuring the volume of gas

Question 13

Inverted measuring cylinder

Answer 13

Collecting and measuring the volume of gas
CO2 cannot be measured by this method

Question 14

solvent

Answer 14

a substance that dissolves a solute

Question 15

solute

Answer 15

a substance that is dissolved in a solvent

Question 16

solution

Answer 16

a mixture of one or more solutes dissolved in a solvent

Question 17

saturated solution

Answer 17

a solution containing the maximum concentration of a solute dissolved in the solvent at a specified temperature