Friday
March 27, 2015

Homework Help: pH

Posted by christine on Friday, May 18, 2007 at 8:31pm.

im trying to calculate the pH of a 1.0L soln containing 53.8 g of completely dissociated Mg(CN)2.

is this the diss. equation?
Mg(CN)2 + water --> MgOH + 2CN^-

i dont think i did the problem rite b/c i got 15.7 for the pH.

i got 53.8M Mg(CN)2 for the initial conc.

or i think it might be 2.03 = pH

i got this from the CN^- equilibrium concentration, which was 2(53.8)= 107.6
pH= -log (107.6)= 2.03

please help..

In the equilibrium concentration, you need that in moles per liter, NOT grams.

isnt the eq conc. 53.8 M (g/L)?

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