Hi Everyone
I am having trouble making Litmus Solution. I have tried 2 recipes. One says to add 10g of Litmus, boil then filter. The filtering takes a long time.
The other says to add 5g and stand for 24hrs then add 2 drops of Sodium Hydroxide. After I make the solution it is a nice purple colour but after it sits for a couple of days it turns a reddish brown colour. Can anyone help?
Litmus solution
- Labbie
- Posts: 3243
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Re: Litmus solution
Litmus Boil 5g in a litre of water. Stand, Filter
Aways worked will for us
Aways worked will for us
Regards Labbie
Lab Manager/Lab Tech, mind reading etc etc
Now retired
Lab Manager/Lab Tech, mind reading etc etc
Now retired
-
- Posts: 217
- Joined: 01 Aug 2017, 12:19
- Job Title: Laboratory technician
- School: College
- State/Location: NSW
Re: Litmus solution
I'd try posting this question on Science Assist for Teresa Gigengack.
- DavidPeterson
- Posts: 196
- Joined: 02 Apr 2012, 12:19
- Job Title: STEM Resource & Lab Manager
- School: Murray Bridge High School
- Suburb: Murray Bridge
- State/Location: SA
Re: Litmus solution
If it's turning red over time, possibly the solution is absorbing CO2 increasing the overall acidity. Make sure it's stored in a sealed bottle.
If this is what is happening, then a bit more NaOH to elevate the pH will return it to blue.
If this is what is happening, then a bit more NaOH to elevate the pH will return it to blue.
DCP
STEM Resource @ Laboratory Manager
RPAS (Drone) Pilot
STEM Resource @ Laboratory Manager
RPAS (Drone) Pilot