How many grams of NaCl are needed to make a 2M stock solution?

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SUMMARY

To prepare a 2M stock solution of NaCl in 50ml, you need to dissolve 5.8 grams of NaCl, calculated using the formula n = m/M, where m is the mass in grams, M is the molar mass (58 g/mol), and n is the number of moles. The calculation involves determining the number of moles required for a 2M solution, which is 0.1 moles in 50ml. The confusion regarding the molecular weight and the conversion to grams is clarified by understanding the relationship between molarity, volume, and molar mass.

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  • Familiarity with the equation n = m/M for calculating moles
  • Basic arithmetic skills for unit conversions and calculations
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liam91
You have to show your attempts at answering the question, this is a forum policy. Also, all homework like questions should go to homework forum.

Homework Statement


- How many grams of NaCl (molecular weight = 58 Da) would you have to dissolve in 50ml to make a 2M stock solution?

The Attempt at a Solution


I have thought about simply multiplying 58 by 0.1 = 5.8 g, but am not sure if this is correct.

It's just the daltons that are throwing me a bit off, also I wasn't too sure if i should be implementing n = m/M.

Thanks everyone.
 
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What relevant equations do you know?
 
liam91 said:
I have thought about simply multiplying 58 by 0.1 = 5.8 g, but am not sure if this is correct.

Where did you got 0.1 from? (Note: I am not saying it is wrong, I am just asking where it came from).
 

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