I'm doing the calculations on the lab "Oxidizing Power of Laundry Bleach," and I'm stuck on one part. This is what I have so far:
My average volume of sodium thiosulfate is 6.94 ML. I then converted that into moles and got 6.94X10^-4 moles. That means that NaClO is equal to that. Then I converted that to grams and got .0258 grams NaClO. I am stuck on determining the mass of NaClO per gram of bleach. What do I do?
What was the mass of the sample?
mass NaClO/g bleach = mass NaClO/mass sample
The mass of bleach? Well, 5 ml was 2.947 grams, but I need the amount per 50 ml sample to do a stoichiometry equation.
The mass of the sample was .0258 grams. then I divide that by 50 ml, multiple by 250 ml bleach sol'n, divide by 5 ml bleach, and divide by density of bleach (.5894). And then I get .0438 grams of ClO. Then I divide .0258 grams and .0438 and get .589, and multiple by 100 to get 58.9%. However, my answer should be around 5%.
You lost me. I can' tell what you did.
ignorant
To determine the mass of NaClO per gram of bleach, you need to know the mass of bleach that was used in your experiment. Once you have that, you can calculate the mass of NaClO per gram of bleach using the following steps:
1. Start by calculating the mass of the bleach used in your experiment. This could be given to you directly or can be obtained by weighing the amount of bleach used.
2. Once you have the mass of the bleach, convert it into grams if it's not already in that unit.
3. Use the moles of NaClO you calculated earlier (6.94 × 10^-4 moles) to find the molar mass of NaClO. The molar mass can be calculated by adding up the atomic masses of the elements in NaClO.
- The atomic masses of Na, Cl, and O are approximately 22.99 g/mol, 35.45 g/mol, and 16.00 g/mol, respectively.
- So, the molar mass of NaClO is 22.99 g/mol + 35.45 g/mol + 16.00 g/mol = 74.44 g/mol.
4. Now, use the molar mass of NaClO and the moles of NaClO to find the mass of NaClO. Multiply the molar mass by the number of moles:
- Mass of NaClO = 74.44 g/mol × 6.94 × 10^-4 moles = 0.0516 grams NaClO.
5. Finally, divide the mass of NaClO (0.0516 grams) by the mass of the bleach (in grams) to determine the mass of NaClO per gram of bleach.
For example, if the mass of the bleach was 2 grams, divide 0.0516 grams by 2 grams, and you will get the mass of NaClO per gram of bleach.