Module 2: Preparation and Standardization of 0.1 N Sodium hydroxide Solution Flashcards
“Transfer” of a substance from one container or vessel to another such WITHOUT LOSING the content by;
– rinsing the original vessel, and
– adding the washings to the receiving vessel
QUANTITATIVE TRANSFER
In standardization,
the “concentration” of a solution is “determined” by titrating it against a _______
primary standard
standards that are solid
Primary Standard
highly purified compound that serves a reference material
Primary Standard
In the experiment, the “concentration” of the “unknown” solution is determined by titrating it against ____________
another standard solution
point where physical change occurs
end point
Standardization of 0.1 N NaOH
UNKNOWN (Not Standardized yet)
0.1N NaOH
(Base)
STANDARD WORKING SOLUTION
standards that are liquid
Secondary Standard
indicator Standardization of 0.1 N Sodium hydroxide Solution
phenolphthalein
The prepared NaOH solution was standardized using?
0.1 N sulfuric acid
Titrated color
permanent faint pink color
Solution of unknown purity but known concentration (Not yet Standardized)
STANDARD WORKING SOLUTION
Standardization of 0.1 N NaOH
KNOWN (Solution, Known Concentration – Standardized
from Lesson 2)
0.1N H2SO4
(Acid)
SECONDARY STANDARD
Dried solid
PRIMARY STANDARD
A highly pure substance
PRIMARY STANDARD
__________ is a substance whose content/purity/concentration has been found by comparison against a primary standard.
SECONDARY STANDARD
– Remember: H2SO4 was standardized
using Na2CO3 (a primary standard)
Is 0.1 N sulfuric acid used as a primary standard?
(Yes or No)
No
Sulfuric acid solution is considered a
SECONDARY STANDARD
Standard Solution (liquid)
SECONDARY STANDARD
Usually, a solution with known concentration
SECONDARY STANDARD
Ex. Sulfuric acid
SECONDARY STANDARD
Ex. Sodium carbonate
PRIMARY STANDARD
Potassium biphthalate, KHC8H4O4
(KHP), MW=204.22 g/mol
– As _________________
Primary standard
HCl solutions and H2SO4 solutions
– As __________________
Secondary standard
Indicator
Phenolphthalein
