PRELIM PART 2

Question 1

means specific amount produced in a unit time or according to a single manufacturing order during same cycle of manufacture

Answer 1

BATCH

Question 2

a batch; or portion of a batch

Answer 2

LOT

Question 3

d, is calculated by finding the differences between individual results and the mean, regardless the sign, adding these differences, and dividing by the number of determinations.

Answer 3

AVERAGE DEVIATION

Question 4

is found by dividing the average deviation by the mean and multiplied by 100 as % or 1000ppt.

Answer 4

RAD

Question 5

• sd or s, preferred measure of precision
• it shows how much variation or
“dispersion” there is from the average (mean or expected value)
• low sd indicated that the data points tend to be very close to the mean and vice versa

Answer 5

STANDARD DEVIATION

Question 6

makes use of control charts, a tool which may influence decision related to the functions of specifications, production or inspection.

Answer 6

STATISTICAL QUALITY CONTROL

Question 7

use actual records of numerical measurement on a full continuous scale such as meter, grams, liter
Ex: mean and R charts

Answer 7

VARIABLE CHART

Question 8

makes use of discrete data classifying the number of items conforming and falling
Ex: P chart (control chart for fraction defective)

Answer 8

ATTRIBUTE CHART

Question 9

normally 3 standard deviation above the center line
Mean + 3 (SD)

Answer 9

UCL

Question 10

3 standard deviation below the center line
• = Mean - 3 (SD)

Answer 10

LCL

Question 11

analytical methods in which the volume of a solution of known concentration consumed during an analysis is taken as a measure of the amount of active
constituent in sample analyzed

Answer 11

TITRIMETRIC METHOD OF ANALYSIS

Question 12

the active constituent in the sample

Answer 12

ANALYTE/TITRAND

Question 13

solution of known concentration
• solution added by means of buret

Answer 13

TITRANT

Question 14

chemical which changes color at or near the point in the titration where equivalent quantities of analyte and titrant have reacted

Answer 14

INDICATOR

Question 15

• theoretical point at which equivalent amounts of each (analyte & titrant) have reacted

Answer 15

EQUIVALENCE POINT

Question 16

a sudden change in color apparent by the use of indicators

Answer 16

END POINT

Question 17

f = # of replaceable OH-
Ex:
NaOH
Mg(OH)2

Answer 17

BASES

Question 18

f = total positive or negative
charges
Ex:
NaCl
MgO

Answer 18

SALTS

Question 19

determination of the exact concentration of the solution
• use of another standard solution known as secondary standard or by the use of carefully weighed sample of a substance of known purity which is termed as primary standard

Answer 19

STANDARDIZATION

Question 20

solution of known concentration (liquid)

Answer 20

SECONDARY STANDARD

Question 21

number of equivalent of solute per liter of solution
• equivalent/liter (eq/L) or milliequivalent/milliliter (mEq/mL)

Answer 21

NORMALITY

Question 22

number of moles of solute per liter of solution
• moles/liter

Answer 22

MOLARITY

Question 23

determination of N or M of solution
•accomplished by the use of another standard solution known as SECONDARY STANDARD or by the use of known purity substance as PRIMARY STANDARD

Answer 23

STANDARDIZATION

Question 24

the weight of substance chemically equivalent to 1 mL of standard solution
•express in mg/mL
N x mEq. wt.

Answer 24

TITER

Question 25

Burets, Pipets

Answer 25

TO DELIVER

Question 26

Volumetric Flask, Graduated Cylinder

Answer 26

TO CONTAIN

Question 27

•graduated glass tubes of uniform bore throughout the whole length •closed at the bottom by glass or stopcock •read at lower meniscus (for clear solutions)

Answer 27

BURETS

Question 28

for bases; a length of tubing connects a separate tip; economical

Answer 28

MOHR

Question 29

built in stopcock; expensive but more accurate

Answer 29

GEISSLER

Question 30

one titrant used, one volumetric solution

Answer 30

DIRECT

Question 31

two titrants, two volumetric solutions

Answer 31

RESIDUAL TITRATION

Question 32

process of repeating the procedure but omitting the sample

Answer 32

BLANK DETERMINATION

Question 33

a chemical process in which an acid reacts with a base •Ex: HCl + NaOH --> NaCl + H2O •Products: Water and Salt

Answer 33

NEUTRALIZATION

Question 34

are complex organic compounds used to: - determine the end point - determine the pH - indicate that a desired change in pH has been effected

Answer 34

INDICATORS

Question 35

the direct or residual titrimetric analysis of bases using an accurately measured volume of acid

Answer 35

ACIDIMETRY

Question 36

conducted by introducing a standard acid solution gradually from a buret into a solution of the base being assayed until chemically equivalent amounts of each have reacted as shown by some change in properties of the mixture

Answer 36

DIRECT TITRATION

Question 37

also known as back titration •frequently used when a reaction proceeds slowly or when the substance to be assayed does not give a distinct, sharp end point with an indicator by direct titration. for compounds which react slowly with titrant •poor solubility •volatile substances

Answer 37

RESIDUAL TITRATION

Question 38

direct or residual titrimetric analysis of acids using a base

Answer 38

ALAKALIMETRY