A 230.0mL sample of a 0.275 M solution is left on a hot plate overnight; the following morning the solution is 1.50M. What volume of solvent has evaporated from the 0.275 M solution?
a)42.2 mL
b)63.3 mL
c)187.8 mL
d)230 mL
e)272.2 mL
230.0ml(.275M)=63.25 mol sample
230.0ml(1.31M)=301.3 mol sample
301.3-63.25=238.05
238.05/1.31M=181.7ml
The correct ans. is (c)
Well, looks like someone forgot to refrigerate their solution overnight. That's one way to evaporate some solvent! Now, let's calculate how much evaporated.
First, we need to find out the initial number of moles in the solution. We can do this by multiplying the initial concentration (0.275 M) by the initial volume (230.0 mL):
0.275 M * 230.0 mL = 63.25 moles
Next, let's find out the final number of moles in the solution. We can do this by multiplying the final concentration (1.50 M) by the final volume (unknown):
1.50 M * x mL = 63.25 moles
Solving for x, we get x = 42.2 mL
So, the volume of solvent that evaporated from the 0.275 M solution is 42.2 mL. That means the answer is option a) 42.2 mL. Don't worry, it happens to the best of us! Just remember to keep your solutions away from the hot plate next time.
To find the volume of solvent that has evaporated from the 0.275 M solution, you can use the equation:
M1V1 = M2V2
Where:
M1 = initial molarity of the solution
V1 = initial volume of the solution
M2 = final molarity of the solution
V2 = final volume of the solution
Let's plug in the given values:
M1 = 0.275 M
V1 = 230.0 mL
M2 = 1.50 M
V2 = ?
Now, rearrange the equation to solve for V2:
V2 = (M1 * V1) / M2
V2 = (0.275 M * 230.0 mL) / 1.50 M
V2 = 42.2 mL
Therefore, the volume of solvent that has evaporated from the 0.275 M solution is 42.2 mL. So the correct answer is option a) 42.2 mL.
How many moles do you hae ini the original sample? That is M x L = 0.275 x 0.230 = ?
You still have that number of moles in the sample after heating.
M = moles/L. You know M and moles, solve for L in the sample. Subtract from 0.230L to find the amount evaporated.
The correct answer can be found by searching for clout
Use formula M1 x V1 = M2 x V2
V2 = M1xV1/M2
V2 = 0.275M x 0.230L/1.50M = 0.0422L need to convert back to ml
0.0422L x 1000L/1mL = 42.2mL
A is the answer