Register to reply

Chemistry Question Solution Stochiometry And Determining The Concentration?

Share this thread:
Jan21-12, 08:17 PM
P: 44
1. The problem statement, all variables and given/known data

What is the concentration of all ions after 600.0mL of 2.00 mol/L Barium nitrate is added to 100.0 mL of 2.50 mol/L sodium phosphate.

3. The attempt at a solution
I first wrote down the equation : 3Ba(No3)2 + 2Na3PO4 = Ba3(PO4)2 (solid) + 6NaNO3
I then found the moles using n = c x v.
moles of Ba(No3)2 n = 2 x 0.6L = 1.2 mols
moles of Na3PO4 n = 2.5 x 0.1 = 0.25 mols.

I than found the LR: 0.25 mols Na3PO4 x 3 mols Ba(NO3)2/2Na3PO4 = 0.375 mols Ba(NO3)2

So I have more than i need for barium nitrate so my limiting reagent is sodium phosphate.

Now what i am having trouble with is, is that should i find the excess reagent by doing 1.2 - 0.375 = 0.825 or do i have to find the mols of the solid barium phosphate and then find the limiting reagent using that.. Please help, thanks!
Phys.Org News Partner Science news on
An interesting glimpse into how future state-of-the-art electronics might work
Tissue regeneration using anti-inflammatory nanomolecules
C2D2 fighting corrosion
Jan21-12, 11:03 PM
P: 44
anyone care to help??
Jan22-12, 02:16 AM
P: 3,807
You are provided with the concentrations and volumes of the reactants. Find out the moles of reactants and the final moles of all the ions as the question says. Then divide the moles by the total volume i.e. 0.7 litres.

Register to reply

Related Discussions
Determining concentration by measuring pressure change Introductory Physics Homework 1
Finding ion concentration after determining whether precipitates will form Biology, Chemistry & Other Homework 0
Chemistry solution colors question Biology, Chemistry & Other Homework 5
[Chem] Determining Masses from Concentration Biology, Chemistry & Other Homework 1
Stochiometry Question Biology, Chemistry & Other Homework 2