Molality is a measure of concentration that relates the moles of solute to the kilograms of solvent, it is described by the following equation:
We are given the molality(2.50m) and kilograms of solvent(0.500kg), so we solve for moles of solute from the equation:
To make a 2.50molal NaOH solution would be needed 1.25moles of solute
Answer: 1.25 moles
Answer:
Approximately (rounded to two significant figures.)
Explanation:
The unit of concentration is the same as
(moles per liter.) On the other hand, the volume of both the
solution and the original
solution here are in milliliters. Convert these two volumes to liters:
Calculate the number of moles of in that
of
solution:
.
reacts with
at a one-to-one ratio:
.
Coefficient ratio:
.
In other words, one mole of would neutralize exactly one mole of
. In this titration,
of
was required. Therefore, the same amount of
should be present in the original solution:
.
Calculate the concentration of the original solution:
.