00:01
So here we're given an example of a specific reaction, and we're given information that we have 1 .0 liters of 1 .0 times 10 to the negative 4 molar, sodium hydroxide, however, only the hydroxide will be significant.
00:16
And we also have 1 liter of 0 .0014 molars of magnesium 2 plus.
00:23
The sulfate will not be significant in this case.
00:27
So based on this information, we're asked to determine whether or not precipitation will occur.
00:33
So first of all, we're just going to assume that these are going to mix without immediately reacting.
00:39
So by mixing the concentrations will decrease.
00:42
And since we have exactly one liter for both of these, the concentration will decrease by perfectly one half.
00:48
So this would be the concentration of hydroxide would become 5 .0 times 10 to negative 5.
00:54
While the concentration of magnesium would be equivalent to 7 .0 times 10 to negative 4 molars.
01:06
And so now we have to plug this into our reaction quotient expression, which is given for current concentrations...