J.R. S. answered • 11/21/17
Tutor
5.0
(145)
Ph.D. in Biochemistry--University Professor--Chemistry Tutor
Sorry, but this question doesn't make sense. You seem to be making an acetic acid/sodium acetate buffer, but then you ask about making 50 ppm FLUORIDE solution. I'm not sure what you are asking. You may want to re-submit this question after reviewing it.
J.R. S.
tutor
Formula? You would just weight out the 4.1057 g of sodium acetate (doubt you can weigh it to 4 decimal places. Then you just measure (using a pipet) the 1.65 ml acetic acid and dilute to 500 ml. However, it doesn't say whether this is glacial acetic acid, or what the concentration of the acetic acid is. Also, I should point out that adding 0.0552 g of sodium fluoride added to 500 ml of buffer DOES NOT result in 50 ppm. If 0.0552 g NaF is added to 500 ml of buffer, you end up with 110.4 ppm. So, sorry again that I can't help you mainly because I'm still not sure what the problem is. If you want to know how to make 500 ml of a pH 5 sodium acetate/acetic acid buffer, then just let me know the concentration of the buffer (0.1M, 0.05M, etc.), and I can show you how to make it.
Report
11/22/17
Jessz J.
500ml of 50 ppm fluoride at pH5 were prepared by mixing 0.0552g of sodium fluoride with 4.1057g of sodium acetate and 1.65 ml of acetic acid.
What I want to ask is the formula to get the amouts of sodium acetate and acetic acid that stated abive.
11/22/17