# chem help asap

posted by .

Describe how you would prepare 250.0 mL of a 0.500 M solution of NaCl by using apparatus found in a chemistry lab.

• chem help asap -

did you try putting it in a 600mL beaker?

• chem help asap -

no

• chem help asap -

The definition of molarity is
M = #mols/Liter of solution.
If you want to do this by math (instead of reasoning), you first plug in 0.5 for M and 0.250 for L and calculate #moles.
0.5=moles/0.250 L
moles NaCl = 0.5 x 0.250 = 0.125 moles.
1 mole NaCl = approximately 58.5 grams. So 0.125 moles NaCl is ......

Or by reasoning, we want 0.5 mole for 0.5 M in 1 L and divide that by 4 for only 1/4 of a liter (250 mL). So we want 1/4 of 1/2 = 1/8 of a mole (or 0.125 mol).

But this isn't the tricky part. The tricky part is telling the prof HOW to prepare the solution. You will want to take 1/8 mole NaCl (about 7 grams or so), place it in a 250 mL volumetric flask, add a little water, swirl until all of the NaCl is dissolved, then make to the mark with water. That will prepare 0.5 M solution in a 250 mL volumetric flask. (Note that I DID NOT say to add about 7 grams NaCl to 250 mL water.).

• chem help asap -

write the steps something like this

• chem help asap -

1. Place 0.125 moles NaCl (7.305 grams) in a 250 mL volumetric flask, add some water, swirl to dissolve all of the NaCl, then make to the mark with water. You PROBABLY should round the 7.305 g to 7.31 grams.

## Similar Questions

1. ### chemistry help

Describe how you would prepare 250.0 mL of a 0.500 M solution of NaCl by using apparatus found in a chemistry lab.
2. ### science-chem

first, thanks so much Bob for helping me!!!! Q4.you will be asked to prepare 25.0 mL of a 0.019 M solution of sodium chloride during this experiment.... a.calculate mass of sodium chloride needed to prepare solution. (0.25L)(0.019M …
3. ### Chemistry

25.0 mL of a NaCl solution (concentration unknown) was found to react with 20 drops of the chloride test solution from the PU Chloride Test Kit. Calculate the mass of NaCl (in grams) in this solution. Calculate the mass of NaCl required …
4. ### Chemistry

You are instructed to prepare 250 mL of a solution which is 50 M in NaCl and 0.10 M in acetic acid. Solid NaCl and a 3.0 M solution are avaliable. How would you prepare this solution?
5. ### Chemistry

describe how you would prepare 250.0 mL of a .500 M solution of NaCl by using apparatus found in a chemistry lab.
6. ### Chemistry

describe how you would prepare 500.0 ml of 0.400M NaCl solution, starting from solid NaCl
7. ### Chemistry

Describe how you would prepare 250.0 mL of a 0.1500 M NaCl solution given that the NaCl is supplied as a solid. Describe how you would prepare 1.25 L of a 0.025 M sucrose solution from a stock solution with concentration of 5.00 M. …
8. ### Chemistry

Describe how you would prepare the following two solutions. Be sure to include the type of glassware which you would use and as much detail as necessary for someone to actually prepare the solution using good laboratory technique. …
9. ### Chemistry

This is due very soon, please help!!! Describe how you would prepare the following two solutions. Be sure to include the type of glassware which you would use and as much detail as necessary for someone to actually prepare the solution …