Computations

Question 1

A carefully determined mass of primary standard is dissolved in a suitable solvent and diluted to a known volume

Answer 1

Direct Method

Question 2

By a known mass of primary standard or secondary standard.

Answer 2

Standardization

Question 3

may not be prepared by direct method due to possible errors in concentrations of the stock solution

Answer 3

HCl

Question 4

is a reagent that is very pure, stable, not hygroscopic, and has a high molecular weight.

Answer 4

primary standard

Question 5

It is also a reagent that we can use to dispense an accurately known amount of analyte.

Answer 5

primary standard

Question 6

is a standard that is prepared in the laboratory for a specific analysis, whose concentration varies with the time.

Answer 6

secondary standard

Question 7

It is a solution of known concentration derived from a primary standard and is usually standardized against a primary standard

Answer 7

secondary standard

Question 8

e.g. Sodium hydroxide, potassium hydroxide, hydrochloric acid, sulphuric acid, potassium permanganate, etc.

Answer 8

secondary standard

Question 9

is a solution of precisely known concentration.

Answer 9

Standard solution

Question 10

is a substance that can be found in a stable, pure, and soluble solid form so that it can be accurately weighed out and dissolved in water to make a solution of known concentration.

Answer 10

Primary standard

Question 11

A _____, also called a ______, is used to deliver solutions in precisely-measured, variable volumes.

Answer 11

buret/ burette

Question 12

________are used primarily for titration, to deliver one reactant until the precise end point of the reaction is reached.

Answer 12

Burets