Posted by **Hilary** on Sunday, October 30, 2011 at 12:04pm.

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?

- Ap Chemistry -
**DrBob222**, Sunday, October 30, 2011 at 1:34pm
What was the mass of the sample?

mass NaClO/g bleach = mass NaClO/mass sample

- Ap Chemistry -
**Hilary**, Sunday, October 30, 2011 at 4:32pm
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.

- Ap Chemistry -
**Hilary**, Sunday, October 30, 2011 at 6:58pm
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%.

- Ap Chemistry -
**DrBob222**, Sunday, October 30, 2011 at 10:51pm
You lost me. I can' tell what you did.

## Answer this Question

## Related Questions

- Chemistry Help Please - Titration of a Sample of Household bleaches: The ...
- Chemistry - Hi DrBob, Sorry about that, I wasn't very clear! Can someone please ...
- Chemistry 2 - The bottle of bleach lists the percentage of sodium hypochlorite ...
- Chemistry - I'm in 10th grade and we did a titration lab; with every lab we have...
- Chemistry: please double check... - Please double check one last time have to ...
- Chemistry - Regular-strength chlorine bleach is a 5.25% solution of NaClO. how ...
- chemistry - If 90 mL of laundry bleach containing a 5.0% w/v concentration of ...
- Chemistry - Can someone please help me complete these calculations for my lab; I...
- chemistry........help!! =) - One brand of laundry bleach is an aqueous solution ...
- Chemistry - To illustrate the calculation, assume that 21.95 mL of a thiosulfate...