November 21, 2024, 05:02:30 AM
Forum Rules: Read This Before Posting


Topic: Make 0.1 M NH3 (aq)  (Read 11564 times)

0 Members and 1 Guest are viewing this topic.

Offline Bakterien

  • Regular Member
  • ***
  • Posts: 33
  • Mole Snacks: +0/-0
Make 0.1 M NH3 (aq)
« on: June 09, 2014, 05:38:00 AM »
How do I mix this solution?

0.1M= Mol/L= (m/M)/L . So if I need 1 L. I will dissolve 0.1*17.03=1.7 g NH3 in 1L water. Is this correct?

Offline Dan

  • Retired Staff
  • Sr. Member
  • *
  • Posts: 4716
  • Mole Snacks: +469/-72
  • Gender: Male
  • Organic Chemist
    • My research
Re: Make 0.1 M NH3 (aq)
« Reply #1 on: June 09, 2014, 05:42:23 AM »
Is this correct?

Yes, 1.7 g of NH3(g).

Practically, it is easier to dilute a conc. ammonia solution though.
My research: Google Scholar and Researchgate

Offline Bakterien

  • Regular Member
  • ***
  • Posts: 33
  • Mole Snacks: +0/-0
Re: Make 0.1 M NH3 (aq)
« Reply #2 on: June 09, 2014, 06:48:35 AM »
Thanks! If I know the conc of a NH3 solution how do I calculate how much water I need to dilute it with?

ex) I have 1L 2 M NH3(aq) and I want 1L 0.1 M NH3(aq).

2M=m/M , m=2*17.03=34.06g

I want 0.1M . 0.1=(m/M)/V  0.1=(34.06/17.03)/V,    V=20L . So I need to dilute it in 20L water in order to get 0.1M. I think I'm wrong. Need *delete me*
« Last Edit: June 09, 2014, 06:59:45 AM by Bakterien »

Offline Dan

  • Retired Staff
  • Sr. Member
  • *
  • Posts: 4716
  • Mole Snacks: +469/-72
  • Gender: Male
  • Organic Chemist
    • My research
Re: Make 0.1 M NH3 (aq)
« Reply #3 on: June 09, 2014, 06:53:45 AM »
Almost - you need to dilute it to a total final volume of 20 L (so add about 19 L of water).

Alternatively, you could dilute a smaller amount of the 2 M stock solution and make 1 L of 0.1 M dilute solution instead of 20 L.
My research: Google Scholar and Researchgate

Offline Bakterien

  • Regular Member
  • ***
  • Posts: 33
  • Mole Snacks: +0/-0
Re: Make 0.1 M NH3 (aq)
« Reply #4 on: June 09, 2014, 07:01:04 AM »
Thanks! I think I understand the theory now. Appreciate your help:)

Sponsored Links