ch 5

Question 1

standardizing

Answer 1

the process of determining the relationship between the signal and the amount of analyte in a sample or a standard

Question 2

primary standard

Answer 2

very pure substance used to quantify an unknown

Question 3

secondary standard

Answer 3

can be used in conjunction with a primary standard

Question 4

reagent

Answer 4

implies a purity of a solvent or ingredient

Question 5

serial dilutions

Answer 5

use standard solution….

Question 6

standard solution

Answer 6

a solution in which the concentration is very well known

Question 7

Why do analytical chemists use serial dilutions?

Answer 7

they are better for obtaining a solution with a super high volume of dilutant with a super small (0.0000g) amount of stock being diluted

Question 8

aliquot

Answer 8

a well defined portion of stock solution

Question 9

How does one determine the amount of stock to use to make a certain concentration of aliquot?

Answer 9

M1V1=M2V2
M1: molarity of stock
V1:(x)

Question 10

external standard

Answer 10

standard material is not mixed with the sample … standards are separate

Question 11

Single Point Calibration (1)

Answer 11

• type of standardization
• not realistic
• ppb/absorbance

Question 12

Multiple External Standards (2)

Answer 12

-include at least 3 standards
-concentration vs response plot
…..extrapolation
……interpolation
…………………..linear regression

Question 13

extrapolation

Answer 13

if a sample is found not to be on the/ out side of the curve… try to get concetration from point ………..you have to dilute if outside of range

Question 14

interpolation

Answer 14

sample within range….?

Question 15

linear regression

Answer 15

the goal of this type of analysis is to determine the best estimates for b_0 and b_1 in
y=Bo+Blx