2.14 g of sodium chloride from a 0.360 M solution?

Question

I'm not sure how to do this. Been trying for hours. Any help would be great. If you can explain how you did it, thats would be really helpful.

The answer is something in mL.

I know M means mols/liters, and I can do other equations. I'm just not sure how to get from grams to mL.

Answer 1

1 litre (1000 ml) of 1 M solution of NaCL contains 23 + 35.5 gms =58.5 gms (ie 1 molecular wt of sodium chloride in gms dissolved in 1 lit of solution)

Hence 1 lit of 0.360 M solution will contain 0.360 X 58.5 gms or 21.06 NaCl (Sodium Chloride)

To find out exact vole in ml which contain 21.14 find volume by this formula 2.14 divide by 21.06 multiply 1000 , (ie 2.14/21.06 * 1000 ) 101.6 ml

PS
basic assumption is 0.360 M indicates .360 Molar solution.
(ie: M stands for Molar)

Answer 2

I assume you mean to say how much of the 0.360 molar solution of sodium chloride do you need to have 2.14 grams of sodium chloride.

List the variables and constants:

The molecular weight of sodium chloride is 58.443 grams/mole (see http://urila.tripod.com/mole.htm).

The sodium chloride solution is 0.360M which means 0.360 mole/liter.

The desired weight of sodium is 2.14 grams.

1000 ml = 1 liter

The question is what volume of 0.360M sodium chloride do I need to have 2.14 grams of sodium chloride in the solution.

Solution:

2.14 grams/58.443 g/mole = 0.03661687456153859 moles (the number goes on and on, but in your final answer you must represent the proper significant figures)

0.03661687456153859 moles/0.360 moles/liter = 0.101714 liters

0.101714 liters = 101.714 ml

So, 1017.14 ml of a 0.360M solution of sodium chloride contains 2.14 grams of sodium chloride

To simplify:
[2.14 grams/58.443 g/mole] [1000 ml/liter/ 0.360 moles/liter] = 101.71 ml
Hope this helps

Answer 3

you need to use the equation for Molarity
Molairty=Moles/liters
1st,.
find the the moles of NaCl(sodium Chloride)
so that is 2.14grams/22.99+35.45 so it's 2.14grams of NaCl divided by the total mass of 58.44. This gives you the moles of NaCl.

2nd. Plug into formual Molarity=moles/liter
you know the molarity .360M and now you know the moles which is .0366 moles of NaCl so just plub it in.

3. Rearange algebraiclly and solve for liters
so it would be moles divided/molarity=liters

4. convert to from Liter to milli liters.
hope that helps or if it doesn't just look up molarity equations solving for liters.

Answer 4

M means moles in one litre of solution.so it means the weight of one mole is dissolved in one litre of the solution.. in your case 0.360 moles of sodium chloride are dissolved in one litre of solution.....since one mole of sodium chloride weighs 58.44 grams (the molecular weight of NaCl), 0.360 moles will weigh 0.360 *58.44 = 21.04 grams...so, 21.04 grams of sodium chloride when dissolved in one litre of water will result in a 0.360M solution... :)

Answer 5

M, for mols of matter. That reference value should be in your book