Posted by **sh** on Sunday, March 7, 2010 at 4:16pm.

What will be the [Cl-] when equal volumes of 0.10MNaCl and 0.20MAlCl3 are combined?

A. 0.35M

B. 0.15M

C. 0.30M

D. 0.70M

- Chemistry -
**DrBob222**, Sunday, March 7, 2010 at 7:20pm
Two ways to do this.

The easy way is to assume any convenient volume, say 100 mL.

mols NaCl = M x L = ??

moles AlCl3 = M x L x 3 + ??

(the x3 comes because there are 3 moles Cl for every 1 mol AlCl3).

Then the definition of M = moles/L. Total moles/total L = ??

The second way is a dilution technique.

Cl form NaCl is 0.1 initially. If that is diluted by an equal volume of the other reagent, this one will be cut in half so it is 0.1/2 = ??

The second one is AlCl3. It is 0.2 M initially, it will be 3x that for Cl^- and that will be 0.6 M in Cl^-, then chop it in half for the dilution with an equal volume of the other reagent. That makes it 0.3 M.

Now add 0.3 M + 0.05 M = ??

You should get the same answer either way.

## Answer this Question

## Related Questions

chem - im studying for a test and i have no idea where to even start for this ...

Chemistry 12 - Will a precipitate form if equal volumes of 0.22 M NH4NO3 and 0....

Chemistry - The pH of a buffer prepared from .30M H2X2O4 and .15M Na2C2O4(Ka of ...

Chemistry - If equal volumes of the following are combined, would they form ...

Chemistry - Please help! If equal volumes of the following are combined, would ...

Chemistry - If equal volumes of the following are combined, would they form ...

Physics - An objectis thrown upward from the edge of a tall building with a ...

University Physics - Building A and Building B are 30m away from each other, on ...

chemistry - Equal volumes of 0.00150M FeCl3 and 0.00200M NaSCN were mixed ...

math - a banquet hall area is in d shape of a rectangle 30m by 20m.part of d ...