posted by ASh .
A scientist wants to make a solution of tribasic sodium phosphate,Na3PO4 , for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 550 ml of a solution that has a concentration of Na+ ions of 1.40M ?
1.40M Na^+ we convert to Na3PO4 which means we need 1.40M x (1 mole Na3PO4/3 mol Na^+) = 1.40 x 1/3 = 0.467 M Na3PO4.
How many moles Na3PO4 do you need? That is M x L = 0.467 x 0.550 = ?
moles Na3PO4 = grams Na3PO4/molar mass Na3PO4. You know moles and molar mass, solve for grams.
ohh that's def the nth root of go to hell and chemistry sucks