00:01
Hello students, here in the question, sodium chloride it is added to 129 ml of water and this solution melts at minus 1 .93 degrees centigrade.
00:22
This is the question.
00:25
The key note is we are supposed to find out how many grams of sodium chloride is added to water.
00:35
Let us consider the solution delta tf is equal to i multiplied by m multiplied by kf.
00:47
Here we have delta tf value is equal to minus 1 .93 degrees centigrade.
00:56
Further if we consider the steps, for sodium chloride, if i is equal to 2, that is sodium ions in solution, m is, if i is equal to 2, m is molarity and kf is equals to 1 .86 degrees centigrade per mole for water.
01:30
Now let us calculate molarity, molarity capital m.
01:39
Capital m is equal to delta tf divided by i multiplied by k f.
01:49
Which is equal to 1 .93 divided by 2 multiplied by 1 .86.
01:58
Let us simplify this.
02:02
Molarity we have a formula related to this.
02:10
Mole of nacl, that is moles of sodium chloride divided by kz of water...
