Homework Help: chemistry

Posted by ASh on Tuesday, February 7, 2012 at 2:38pm.

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 ?

chemistry - DrBob222, Tuesday, February 7, 2012 at 3:01pm
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.
chemistry - Anonymous, Thursday, February 16, 2012 at 2:42am
ohh thats def the nth root of go to hell and chemistry sucks

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