How many grams of sodium ion Na are in 1.90g toothpaste?
Published: October 16th, 2009
A toothpaste contains 0.24 by mass sodium fluoride used to prevent dental caries and 0.30 by mass triclosan C12H7Cl3O2, a preservative and antigingivitis agent. One tube contains 124g toothpaste.
A toothpaste contains 0.24% by mass sodium fluoride used to prevent dental caries and 0.30% by mass triclosan C12H7Cl13O2 , a preservative and antigingivitis agent. One tube contains 124g toothpaste.
I continue to be frustrated by questions that do not contain units. Tootpaste contains 0.24by mass etc etc, 0.24 what?
I would willingly answer this question if I knew what the details of the question are. Please submit details properly.
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October 16th, 2009 at 2:35 pm
I continue to be frustrated by questions that do not contain units. Tootpaste contains 0.24by mass etc etc, 0.24 what?
I would willingly answer this question if I knew what the details of the question are. Please submit details properly.
References :
October 16th, 2009 at 3:18 pm
Hi,
Assuming that you mean that there is a 0.24 faction of NaF in the toothpaste (i.e., 24%) then…
1) The weight of NaF in 1.90gr of toothpaste is: 1.9 x 0.24 = 0.456gr
2) To figure out the ratio of Sodium (Na) in NaF we’ll use the atomic mass of the two atoms: Mw(Na) / [Mw(Na)+Mw(F)] = 23/[23+19] = 0.548
3) Thus, using the ration of Sodium in Sodium Fluoride and the total grams of Sodium Fluoride in the toothpaste, we calculate that the weight of sodium in 1.9gr of toothpaste is: 0.456gr x 0.548 = 0.250gr = 250mg.
Good Luck,
Ron Novik.
References :