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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: saadaziz on October 07, 2009, 11:47:55 AM

Title: Chemical In Excess Question
Post by: saadaziz on October 07, 2009, 11:47:55 AM

25cm3 of a 0.20M NaCl solution were mixed with 25cm3 of a 0.15M Pb(NO3)2 solution.
a. Calculate the chemical that was in excess

i don't know what to do plz explain how you do this type of equation

Title: Re: Chemical In Excess Question
Post by: Borek on October 07, 2009, 12:09:43 PM

What do you know about solubility of chlorides?

Title: Re: Chemical In Excess Question
Post by: saadaziz on October 08, 2009, 11:05:04 AM

all chlorides are soluble except pb hg and ag

Title: Re: Chemical In Excess Question
Post by: saadaziz on October 08, 2009, 12:07:57 PM

sorry for the double post anyways i think i figured it out please tell me if am right

Pb2+(aq) + 2Cl- (aq) → PbCl2(S)
1              2 
2.5            5

2.5 as pb is only 1 mole so thus 2.5 and because CL is 2 moles we double the 2.5 to make 5 resulting in
Pb2+ being in excess
Right or wrong?