October 27, 2020, 05:45:58 PM
Forum Rules: Read This Before Posting

### Topic: Chemical In Excess Question  (Read 2642 times)

0 Members and 1 Guest are viewing this topic.

• New Member
• Posts: 6
• Mole Snacks: +0/-0
##### Chemical In Excess Question
« 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

#### Borek

• Mr. pH
• Deity Member
• Posts: 26060
• Mole Snacks: +1699/-402
• Gender:
• I am known to be occasionally wrong.
##### Re: Chemical In Excess Question
« Reply #1 on: October 07, 2009, 12:09:43 PM »
What do you know about solubility of chlorides?
ChemBuddy chemical calculators - stoichiometry, pH, concentration, buffer preparation, titrations.info, pH-meter.info

• New Member
• Posts: 6
• Mole Snacks: +0/-0
##### Re: Chemical In Excess Question
« Reply #2 on: October 08, 2009, 11:05:04 AM »
all chlorides are soluble except pb hg and ag

• New Member
• Posts: 6
• Mole Snacks: +0/-0
##### Re: Chemical In Excess Question
« Reply #3 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?