WARNING! Very long answer! Here are my suggestions.
This one is easy.
The molar mass of
Simply transfer 40.00 g of
Add enough water to dissolve the
If you need to know the concentration to more than 1 significant figure, you must standardize the solution by titrating an aliquot with an acid of known concentration.
The structure of Lisinopril is
Its molar mass is 405.49 g/mol.
Per the US Pharmacopoeia, Lisinopril tablets must contain between 90 % and 110 % of the labelled amount of
Preparing the solution:
Calculate the mass of Lisinopril needed to prepare I L of a 1 nmol/L solution.
For easier writing, let's symbolize Lisinopril as
So, we want a solution that contains
It looks like a serial dilution is in order.
How about this?
Step 1: Dissolve 40 mg of
Step 2: Dilute 1 mL of this solution to 1 L.
We can use the formula
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Step 3: Dilute 1 mL of this solution to 1 L.
If you need more precision, you will have to analyze the solution according to the methods of the US Pharmacopoeia.