is there an equation to find mass percent....if know concentration and and final and initial volume of a titration lab?
there isnt one
then how do you find mass percent?
M x L = mols of titrant.
From the equation, convert to mols of unknown.
Mols of unknown x molar mass = grams.
(grams/sample weight)*100 = mass percent.
To find the mass percent in a titration lab, you need to follow these steps:
1. Calculate the number of moles of the titrant used in the titration. You can do this by multiplying the molarity (M) of the titrant by the volume (L) used in the titration. This gives you the moles of the titrant.
2. Determine the stoichiometry of the reaction between the titrant and the unknown substance. This step is crucial because it allows you to convert the moles of the titrant to moles of the unknown substance.
3. Once you have the moles of the unknown substance, multiply it by the molar mass of the unknown substance. This will give you the mass of the unknown substance in grams.
4. Find the mass of the sample used in the titration by weighing it. Divide the mass of the unknown substance by the mass of the sample and multiply it by 100 to get the mass percent.
In summary, the formula for finding the mass percent in a titration lab involves calculating the moles of the titrant, converting those moles to moles of the unknown substance, determining the mass of the unknown substance in grams, and finally dividing that mass by the mass of the sample and multiplying by 100.