Chemistry

posted by S

A student mixed 15.0 mL of a solution of 0.0200 M ferric chloride FeCl3, with 25.0 mL of water.

Calculate the moles of iron ion, Fe +3 in the resulting solution.

(I think this is a Dilution problem, but I wasn't really sure how to start it out. Any help would be greatly appreciated.)

Here is what I started off with, but then I got confused:

M= moles solute/ 1 L solution

Moles of solute = (M)(1 L solution)
Moles Fe +3 = (0.0200M)(0.015L)
= 0.0003

1. DrBob222

Assuming the volumes are additive (that is, is 15.0 + 25.0 = 40.0 mL), then
0.0200 x (15.0/40.0) = ?M
Or you can use the dilution formula as follows:
15.0*0.0200 = 40.0*M
M = 15.0*0.0200/40.0.

moles Fe^3+ = M x L = 0.02 x 0.015L = 0.0003 moles.
Then M of new soln = mol/L = 0.0003/0.040L = 0.0075 M. See if this is the same answer as both of the two above.

2. S

Wouldn't I just leave the answer as 0.0003 moles since the question is asking for the amount of the moles of the iron ion Fe +3 ? :) That's when I got confused.

3. DrBob222

You are right and I am wrong. Your remark about being a dilution problem started my mind in the direction of molarity and I went in that direction. However, you are absolutely right, moles is what the problem asks you do do and M x L = 0.0003 moles is correct.

4. S

Thanks so much for your feedback! :)

Similar Questions

1. Chemistry

How would you prepare 2.5 L of a 0.05 M solution of iron (III) chloride using iron (III) chloride hexahydrate Since 1 mol iron(III)chloride hexahydrate contains 1 mol iron(III) chloride, use the molar mass of the hexahydrate. M x L …
2. Chem

As a part of a study to see whther just the chloride ion on NaCl accelerates the rusting of iron, a student decided to see whtjer iron rusted in a solution on Na2SO4. The solution was made by dissolving 4.550 g of Na2SO4 in water using …
3. AP Chemistry

A buffer solution contains .4mol of formic acid, HCOOH and a .6mol of sodium formate, HCOONa, in 1L of solution. Ka of formic acid is 1.8 x 10^-4. a) calculate pH b) if 100ml of this buffer solution is diluted to a volume of 1L with …
4. Chemistry

1) The formation of water is represented by the following equation : 2H2(g) + O2(g) -> 2H2O(g) a.What is the limiting reactant if 4 mol of oxygen reacts with 16 mol of hydrogen?
5. Chemistry (reposts#2)

A solution is prepared by dissolving 5.00 g of ferric chloride in enough water to make 500.0 mL of stock solution. A 50.0 mL aliquot (portion) of this stock solution is then removed and added to 75.0 mL of water. Calculate the concentrations …
6. chemistry

a student was asked to prepare 100.0 mL of 0.0200 M solution of HCL from 0.400 M solution of HCL. in order to do this he measured 5.0 mL of 0.400 M HCL with a graduated cylinder, transfered this amount to a 100 mL beaker, added 95 …
7. chemistry

in an experiment, a 4.000grams sample of aluminum metal is added to a solution containing 5.000grams of dissolved iron chloride. the reaction results in the formation of aluminum chloride and metallic iron. when the reaction is complete, …
8. AP Chemistry

An unknown amount of water is mixed with 350 mL of a 6 M solution of NaOH solution. A 75 mL sample of the resulting solution is titrated to neutrality with 52.5 mL of 6 M HCl. Calculate the concentration of the diluted NaOH solution. …
9. Biology

You begin with 10 ml of 2% acetic acid, and you add 90 ml of water. We will call the resulting solution "dilution#1". What is its concentration?
10. Chemistry

A solution is created by dissolving 13.0 grams of ammonium chloride in enough water to make 265 mL of solution. How many moles of ammonium chloride are present in the resulting solution?

More Similar Questions