Exam 2

Question 1

acid

Answer 1

substance that increases the concentration of hydronium ion h3o

Question 2

Base

Answer 2

decreases the concentration of hydronium ion h3o in aqueous solution

Question 3

Bronsted-Lowry acid

Answer 3

proton donor

Question 4

Bronsted-Lowry base

Answer 4

proton acceptor

Question 5

proton

Answer 5

the species h because a proton is All That Remains when a hydrogen atom loses its electron

Question 6

conjugate acids and bases

Answer 6

are related by the gain or loss of one proton

Question 7

absorption, occlusion, or inclusion of impurities along with the desired and a analyte in a precipitate

Answer 7

Co precipitation

Question 8

binding of impurities to the surface of a crystal

Answer 8

adsorption

Question 9

inclusion or occlusion of impurities within a crystal

Answer 9

absorption

Question 10

isolation of a trace component for analysis by Co precipitation with a major component in the solution

Answer 10

Gathering

Question 11

treatment of impurities with an agent to prevent Co precipitation with the desired analyte

Answer 11

masking

Question 12

letting a precipitate stand with the mother liquor to promote slow recrystallization

Answer 12

digestion

Question 13

breaking up of a precipitant upon washing with water in the absence of an electrolyte

Answer 13

peptization

Question 14

what is the purpose of adding tartaric acid in the nickel & nickel oxide experiment

Answer 14

create a soluble iron complex

Question 15

if you forget to add the tartaric acid before adding the ammonia what will happen. adding it after completing the precipitation step

Answer 15

the mass percent will be higher than

Question 16

what three properties are desirable for gravimetric analysis precipitate

Answer 16

be of known composition, pure, insoluble

Question 17

in the manganese and steel lab if you used a lower wavelength than you should what will happen to the concentration

Answer 17

it will be too high

Question 18

oxidation agent for color development

Answer 18

potassium periodate

Question 19

oxidizes carbon

Answer 19

ammonium persulfate

Question 20

forms a colorless complex with iron

Answer 20

phosphoric acid

Question 21

mild reducing agent to keep manganese in the 2 + oxidation state

Answer 21

ascorbic acid

Question 22

chelating agent

Answer 22

EDTA

Question 23

standard for EDTA standardization

Answer 23

zinc metal

Question 24

buffer capacity is maximum when

Answer 24

pH = PKa

Question 25

a solution containing conjugate acid base pairs

Answer 25

buffers

Question 26

when moles of added titrant are exactly sufficient for stoichiometric reaction with analyte

Answer 26

equivalence point

Question 27

a molecule with both positive and negative charges

Answer 27

zwitterion

Question 28

carbonic acid from CO2 and amino acids from proteins are examples of

Answer 28

polyprotic acids

Question 29

a molecule that can both donate and accept a proton is

Answer 29

Amphiprotic