Posted by **Korina** on Tuesday, December 14, 2010 at 7:55pm.

A laboratory technician is required to prepare a quarter normal saline solution (0.22% w/v) from the stock normal saline solution.

1. What is the dilution factor required?

I have 4-fold dilution - is that correct?

2. Ise this dilution factor to calculate the volume of stock needed if one litre of the diluted solution is to be prepared.

I have 0.22 over (divided by) 0.91 = 0.2417582 - is that correct? And how do I then convert it into a fraction in its lowest form?

Thanks.

- Chemistry -
**DrBob222**, Tuesday, December 14, 2010 at 8:25pm
I don't know how accurately you want this done but I would think a quarter normal solution would be 0.91/4 = 0.2275 in which case 4-fold dilution is needed.

2. I don't think it is needed.

If we use M x mL = M x mL, then

0.91/100 x mL = 0.2275/100 x 1,000

mL = 0.2275*1000/0.91 = 250. mL.

- Chemistry -
**Korina**, Wednesday, December 15, 2010 at 1:58am
Hi DrBob222,

Thanks for your help.

:-)

## Answer This Question

## Related Questions

- Calculating Dilutions - 1. 1 ml serum added to 5 ml saline. 1:2 dilution is made...
- dilution please help - How to use serial dilution to dilute a stock solution at ...
- chem engineering - Mass balance on an intravenous injection (IV) bag A nurse ...
- Chemistry - Prepare a 0.0200 mM dye solution at low pH by dilution 0.40 ml of ...
- algebra - Nurse erika needs to prepare 12 liters of a 10% saline solution. The ...
- algebra - Nurse erika needs to prepare 12 liters of a 10% saline solution. The ...
- ChemII - A saline solution is 0.9% NaCl. What masses of NaCl and water would be ...
- math - a pharmacist mixed some 10% saline solution with some 15% saline solution...
- Chemistryyy - a) A standard solution of 0.243 M NaOH was used to determine the ...
- math - you have an unlimited supply of 5% saline solution and 8% saline solution...

More Related Questions