00:01
For this question, we're given a volumetric flask that is 25 .0 milliliters and it is empty.
00:09
Put on an analytical balance, the mass is measured and the mass of the empty flask is 35 .6783 grams and then sodium chloride is added to it and when the addition of sodium chloride we get a mass of 36 .2365 grams and what we're looking for is the concentration of the sodium chloride solution in grams per milliliter.
00:44
So first we need to figure out then how many grams of sodium chloride is in the solution.
00:50
So if we look at the two values that we have, we have the masses of the flasks.
00:57
So if i take the bottom value away from the top value, what we're actually subtracting is the volumetric flask.
01:07
So what should be left over should be the mass in grams of just the sodium chloride.
01:14
So if we subtract the two values, we get a value of 0 .5582 grams and it is important for scientific, for sigfigs i mean, that we maintain the four decimal places for these two numbers.
01:36
Okay well now that many grams, the 0 .5582 grams of sodium chloride was put into the 25 .0 milliliter volumetric flask...