8D.1 making standard solutions Flashcards
what is a standard solution
it is a solution whose concentration is accurately known
how do you make a standard solution
by taking a substance of known weight then dissolving it in water to form a solution with a known volume
what are the primary standards
they are substances that are used to make a standard solution by weighing
a primary standard should be?
- solids with a high molar mass
- available in a high degree of purity
- is chemically stable (doesn’t decompose or react with the air
- doesn’t absorb water from the atmosphere
- is soluble in water
- reacts completely and rapidly with instances during titrations
why is HCl not considered a primary standard
BECAUSEEEEEEE it cannot exist in the solid form
why is NaOH not considered a primary standard
because it can react with the carbon dioxide in the atmosphere as well as absorb water vapor, it can be weight accurately but we are not sure what’s being weighed exactly cause there might be unknown masses of Sodium carbonate and water mixed with the NaOH
what is the Chemical equation of sulfamic acid
NH2SO3H
how do you calculate the mass of sulfamic acid
by using c= n/v to find n the n=m/M to find m
what is the method used to calculate the concentration of the standard solution
page 218
what are the apparatus used for the calculation of the concentration of the standard solution
page 218
when filling up to volumetric flask what is important to do
make sure that the lowest part of the liquid is aligned with the graduation mark
