Volume/Volume %, manipulating units

[susan__t]

I am trying to find % acetic acid by volume in vinegar.

I have 8*10-4 mol/L of acetic acid in vinegar and 8*10-5 of acetic acid in the dilute sample of vinegar and water.

I know that the volume/volume % is equal to the amounts of A divided by the total amounts of A and B. BUT that they also should be in mL, considering the density (the assumed density) of water, vinegar and acetic acid is 1.00g/mL.

So I'm having trouble with finding out how to convert the mol/L into just mL. Also having trouble figuring out what A and A+B are. I am assuming A is the volume of acetic acid in vinegar and A+B is the volume of acetic acid in the dilute sample?

Thanks

 

[chemisttree]

mol/L can be converted into grams/L which can be converted into grams/100mL.

 

[Blueshift5]

for your question. To find the % acetic acid by volume in vinegar, we need to first convert the given concentration of acetic acid in mol/L to volume in mL. This can be done by using the formula C = n/V, where C is the concentration in mol/L, n is the number of moles, and V is the volume in liters. Since we are looking for the volume in mL, we can multiply the concentration by 1000 to convert from L to mL.

So for the 8*10^-4 mol/L concentration, we would have (8*10^-4 mol/L) * (1000 mL/L) = 0.8 mL of acetic acid in 1 L of vinegar.

Next, we need to find the total volume of the vinegar and water mixture. This can be done by using the formula Vtotal = Vvinegar + Vwater, where Vvinegar is the volume of vinegar and Vwater is the volume of water.

In this case, we are given that the dilute sample has 8*10^-5 mol/L of acetic acid. Using the same formula as before, we can find the volume of acetic acid in 1 L of the dilute sample as 0.08 mL.

Now, we can plug these values into the formula for volume/volume %, which is (Vacid/Vtotal) * 100%.

So, for the vinegar, we have (0.8 mL/1 L) * 100% = 0.08% acetic acid by volume. And for the dilute sample, we have (0.08 mL/1 L) * 100% = 0.008% acetic acid by volume.

In terms of A and A+B, A would represent the volume of acetic acid in the vinegar and A+B would represent the total volume of acetic acid in the vinegar and water mixture.

I hope this helps clarify the calculation process for finding % acetic acid by volume in vinegar. Let me know if you have any further questions.