# Chemistry

posted by .

Use the dilution relationship (Mi x Vi = Mf x Vf) to calculate the volume of 0.500 M NaOH needed to prepare 500 mL of .250 M NaOH.

This is my work

? L Solution = 500mL x (1L/1000mL) = .500L

? mol NaOH = .500 L Solution x (0.250 M NaOH/1 L Solution) = .125 mol NaOH

? L solution = .125 mol NaOH x (1L Solution/.500 mol NaOH) = .25

The problem then asks me to round my answer to the nearest ones place, so i have a feeling this equation has an error. Can anyone guide me to getting it right? Thanks!

• Chemistry -

Why did you shift to liters as the unit of volume. I would have used ml as the volume unit, I suspect that is what the problem intended (but did not say so).

• Chemistry -

Aren't you looking for the molarity in this equation. If so, the molarity equation is M = moles of solute / Liters of Solution

• Chemistry -

You didn't follow the instructions and I don't see that you used MxV= MxV
?? mL x 0.500 M = 500 mL x 0.250 M
?? mL = 500 x 0.250/0.500 = 250 mL.

• Chemistry -

No, you aren't looking for the molarity. You have molarity of solution 1 and you have molarity of solution 2. You are looking for volume (and you solved for that and obtained 0.250 L which is the same as 250 mL). So I would round my answer to 250 mL.

• Chemistry -

Alright, I see my error. I appreciate the help :)

## Similar Questions

1. ### science

how would you make 500.0mL of a 0.200M NaOH solution from a 15.0 M stock NaOH solution?
2. ### Chemistry

You have a bottle of 20% NaOH. You will use some of it to make a new solution by dilution with water. How musch 20% NaOH is needed to prepare 150mL of 7% NaOH by dilution.
3. ### chemistry

Prepare 500mL of a 0.200 M acetate buffer at pH 4.90 using only pure acetic acid, 3M NaOH, and water. 1) Add acetic acid to ~400mL of water in a 500 mL beaker. How many grams of acetic acid are needed?
4. ### Chemistry

500.0mL of 0.220 mol/L HCl(aq) was added to a high quality insulated calorimeter containing 500.0mL of 0.200mol/L NaOH(aq).Both solutions had a density of 1.000g/mL & a specific heat of 4.184 J/g.K. The calorimeter had a heat capacity …
5. ### Chemistry

Q1: You wish to prepare a buffer solution with pH = 11.10. What volume of 6.0 M HCl would you add to 500 mL of 0.10 M (C2H5)2NH to prepare the buffer?
6. ### Chemistry

Q1: You wish to prepare a buffer solution with pH = 11.10. What volume of 6.0 M HCl would you add to 500 mL of 0.10 M (C2H5)2NH to prepare the buffer?
7. ### chemistry

A 2.5 g sample of NaOH (Mw = 40.00) was dissolved in water to give a solution of final volume 250 cm3. (i) With reasons, state whether NaOH is a strong or a weak base. Give the conjugate acid of NaOH and decide whether this conjugate …
8. ### SEATTLE

Determine the volume of base ml needed to prepare the following 500 ml of 0.18 % NaOH SOLUTION USING A 10.0 % NaOH SOLUTION
9. ### chemistry

Calculate the volume of concentrated NaOH solution (which contains 500.00g of NaOH per liter of solution) that you will need to make 1.00L of a 0.100M NaOH solution
10. ### Chemistry

If there are 10 groups performing an experiment and each group needed 25.0 mL of 0.250 M NaOH, how would you prepare the NaOH solution for the whole lab using the NaOH pellets?

More Similar Questions