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Topic: I need help understanding this.. plzzz help me :)  (Read 3781 times)

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Offline Danielle

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I need help understanding this.. plzzz help me :)
« on: April 27, 2009, 12:42:34 AM »
1. How many grams of solute is required to prepare 1.000 L of 1.000 M Pb(NO3)2? What is the molar concentration of the solution for each of the ions?

 ???

Offline UG

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Re: I need help understanding this.. plzzz help me :)
« Reply #1 on: April 27, 2009, 12:56:15 AM »
Can you please show an attempt so that we know what you are having trouble with?

Offline mehc

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Re: I need help understanding this.. plzzz help me :)
« Reply #2 on: April 29, 2009, 10:13:22 AM »
1.00 M lead (II) nitrate solution mean one mole of Pb(NO3)2 in one litre of water (Solvent). One mole of Pb(NO3)2 is equal to 331.2 g.

In order to calculate individual ions molarity, use coefficients
from the balanced dissolution equation.
Pb(NO3)2  = Pb2+  + 2NO3-

e.g. for nitrate ions molarity
(1 mole Pb(NO3)2 /1 liter soln) x(2 mole NO3-/1 mole Pb(NO3)2 )
= 2 mole NO3- / 1 L soln. or 2 M NO3-

Hope it will help.

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