00:01
So to solve for this, we are calculating the malarity of the given solution.
00:08
So you have to remember that malarity is equivalent to the most of the solute over the volume of the solution, which should be in liters.
00:21
So using this formula, let's calculate our unknown here.
00:26
First solution, we have 45 grams of an 8204, so that.
00:31
Sodium sulfate we have 45 .0 grams of an 82s .4 how do we convert this to moles we will divide the molar mass of an 82s .o4 molar mass of sodium sulfate is 142 .0 4 grams per mold of sodium sulfate over the volume of the solution so we have 500 ml it's 5 .0 times centid it are up 2ml so remember malarities in terms of liter so we'll convert ml to liters.
01:03
Kassanml is 1 liter.
01:06
Cancel this, grams.
01:11
And we'll get 0 .634.
01:15
This is moles per liter.
01:20
Okay, and as to the question, how would you prepare the solution? you place first your salute that is sodium sulfate, which is 45 grams.
01:32
Okay so you weigh you put 45 grams of sodium sulfate in the glassware and then you add the solvent okay up to the 500m .m.
01:47
Mark in the glassware okay and then second solution polarity will be equivalent to 1 to 5 grams up this is ethanol c2h 50h convert this to moles by dividing the molar mass of ethanol, 46 .07 grams...