APPARATUS, CHEMICALS AND UNIT OPERATIONS

Question 1

Measure masses with high accuracy. Uses electromagnetic force compensation to balance the load on the pan.

Answer 1

Analytical Balance

Question 2

What are the types of analytical balance?

Answer 2

1. Microbalance - 160 g to 200 g
2. Semimicro analytical balance- 10 g to 30 g
3. Microanalytical balance- 1g to 3 g

Question 3

What are the sources of error in weighing

Answer 3

Buoyancy error
effects of temperature

Question 4

The weighing error that develops when the object being weighed has a significantly different density than the masses.

Answer 4

Buoyancy Error

Question 5

A device for drying substances or objects and to minimize the uptake of moisture, dried materials are stored in desiccators while they cool.

Answer 5

desiccators

Question 6

Hygroscopic substances that attract and absorb moisture from the surrounding air to maintain a state of dryness.

Answer 6

Dessicant

Question 7

Are used as containers for the high temperature fusion of samples that are not soluble in aqueous reagents

Answer 7

Simple Crucibles

Question 8

collection of a precipitate with a filtering crucible is frequently less time consuming with paper.

Answer 8

Filtering Crucibles.

Question 9

Are manufactured is fine, medium and coarse porosities. Temperature limit is about 200 degrees

Answer 9

Sintered glass crucibles.

Question 10

Has a perforated bottom that supports a fibrous mat

Answer 10

Gooch Crucible

Question 11

They are used for the separation of solid particles from liquid to gas.

Answer 11

Filter Paper.

Question 12

What is the filtration and ignition of solids heating equipment?

Answer 12

1. Microwave Laboratory
2. Heat lamp
3. Burners
4. Muffle Furnance

Question 13

Use to extract, transport and dispense liquid samples.

Answer 13

Pipets.

Question 13

A glass tube with graduations enabling us to measure the volume of liquid delivered through the stopcock the valve of the bottom.

Answer 13

Burets

Question 14

Are calibrated in convenient units to permit delivery of any volume up to a maximum capacity ranging from 0.1 to 25 ml

Answer 14

Measuring Pipets

Question 15

Delivers a single, fixed volume between 0.5 and 200 ML

Answer 15

Volumetric or transfer pipet

Question 16

Curved surface of a liquid

Answer 16

Meniscus

Question 17

Is a condition that causes the volume to appear smaller than its actual value if the meniscus is viewed from above and larger if the meniscus is viewed from below.

Answer 17

Parallax

Question 18

A high purity grade which is usually equal to the ACS

Answer 18

Reagent Grade

Question 19

Have capacities ranging from 5 mL to 5 L and are calibrated “ to contain” specified volume. Used for the preparation of standard solutions and for the dilution of samples to a fixed volume.

Answer 19

Volumetric Flask

Question 20

Of exceptional purity that is specially manufactured for standardizing volumetric solutions and preparing reference standards.

Answer 20

Primary Standard Grade.