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rgg
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harshal
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 Posted: Fri Jul 07, 2006 11:25 am Post subject: |
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Hi raghu
Very Interesting. I guess if we have a home made ph paper it will be really cost effective lets c if this works!!
This is definately something very interesting. Thank you raghu.
Regards
Harshal. |
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gokulin
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| Posted: Fri Jul 07, 2006 5:32 pm Post subject: |
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| But this won't give us accurate ph?? How could we use it in the Aquarium?? |
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sandeepraghuvanshi
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| Posted: Fri Jul 07, 2006 5:49 pm Post subject: |
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I think these strips can be only useful if they can be calibrated.
Without calibration I don't think they can be accurate.
Also the colour might also depend upon the concertration & quality of juice used. |
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rgg
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| Posted: Mon Jul 10, 2006 3:21 pm Post subject: |
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Not sure about you comments sandeep.
I feel that these should be as good as the broad scale PH indicators
As far as concentartion goes, it should not really matter, As all indicators irrespective of the ones used have the property to indicate and are not dependent on the concentration, Unless the quantity of the indicator itself is comparable with the test-solution.
If this would be the case then does the amount of indicator we use for test matter, I would say certainly not!!!!!!!! Unless the quantity of the indicator itself is comparable with the test-solution.
-Raghu |
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sandeepraghuvanshi
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| Posted: Mon Jul 10, 2006 4:01 pm Post subject: |
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| rgg wrote:
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Not sure about you comments sandeep.
I feel that these should be as good as the broad scale PH indicators
As far as concentartion goes, it should not really matter, As all indicators irrespective of the ones used have the property to indicate and are not dependent on the concentration, Unless the quantity of the indicator itself is comparable with the test-solution.
If this would be the case then does the amount of indicator we use for test matter, I would say certainly not!!!!!!!! Unless the quantity of the indicator itself is comparable with the test-solution.
-Raghu
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Hi,
The quantity of indicator would not matter when the quantity of indicator in reagent if fixed as is in case of chemical reagents.
However when we extract our own indicator, we will not know what is the quantity of indicator in the soultion.
In such a case, I think if we calibrate the juice aganist a solution of known nitrate or nitrite solution we can come to a better judgement. |
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rgg
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| Posted: Mon Jul 24, 2006 2:40 pm Post subject: Re: DIY PH strips |
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I was able to calibrate the Juice of cabbage with that of the PH indicator at different levels and found very very similar results,
I tried it out on many home available acids and bases in a test tube and got similar results as of a wide band PH indicator.
Hence my opinion is that we can use this as a replacement for our PH indicators also, The only draw back of this being, Filty fermented smell when stored in containers for very long durations.....
But PH DIY strips should not have this problem as they are dried.
Not sure if one can use this as a wine when stored for long durations, As i do not have personal interest in it.
-Raghu |
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madhu_ulysses
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| Posted: Mon Jul 24, 2006 6:10 pm Post subject: Re: DIY PH strips |
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| pH itself is a very tricky phenomenon & before using any method, its always better to test it with a standardized method. |
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karna
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| Posted: Fri Mar 16, 2007 4:52 pm Post subject: Re: DIY PH strips |
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I felt that I was reading a chemistry lesson for my examination the information is so exhaustive. I think making the ph strips with the red cabbage juice is pretty easy but calibrating it to get the correct pH reading is the challenge.
Regards,
Karna |
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deepesh
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| Posted: Fri Mar 16, 2007 10:37 pm Post subject: Re: DIY PH strips |
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Apart from calibration we also need an indicator sensitive over the range aquarists are interested in about 6 to 8. I mean it should show a good difference in color with even small changes in pH - approx 0.1
Deepesh |
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murthy
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| Posted: Fri Mar 16, 2007 11:21 pm Post subject: Re: DIY PH strips |
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The idea is good,here is how I would use it:
First use a good(standard) pH test kit and establish the pH of the tank water.Simultaneously use the cabbage juice method.Note the pH from both.The pH would then be noted at regular intervals with both test kits(standard and DIY).As soon as the standard test kit is exhausted dont bother to buy another one,simply keep using the DIY kit.
I guess at this stage getting an "exact" pH is irrelevant,as long as the pH is consistent.So if the water was 8.3 all along with the standard test kit,and DIY kit gave the same color,it stands to reason that as long as the DIY solution gives the same color your pH is within safe limits.
We normally use a pH test kit to test consistent pH....not to establish a new pH every day!So a change in color of juice kit is good enough to tell there is trouble. |
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deepesh
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| Posted: Fri Mar 16, 2007 11:47 pm Post subject: Re: DIY PH strips |
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But is it sensitive enough to show major changes in aquarium pH? A very small shift in pH for a lab is big time major change for a fish. The cabbage dye pH indicator scale in the link shows only little change in color between 6 and 7 as well as between 7 and 8. Would that be readily detectable every 24 hours? Let alone every once in a few days?
Deepesh |
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murthy
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| Posted: Sat Mar 17, 2007 1:45 am Post subject: Re: DIY PH strips |
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 I actually went through the link after deepesh's post....its a project fit for my daughter;cute but juvenile.There is too much at stake to trust cabbage!
This brings up another interesting point(at the risk of a little deviation from the topic).....how many of you guys out there ACTUALLY test pH on a regular basis?I must confess....the only time I ever tested the pH of my tap water was when we first shifted into our flat!Of late I have been testing the pH of my marine tank-that too only once in two weeks(and found the same pH,only I was poorer by 9 drops of pH test liquid)
Are there a lot of hobbyists seriously meddling with water chemistry?(needlessly)..... |
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Severumkid
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| Posted: Wed Jul 11, 2007 1:09 am Post subject: Re: DIY PH strips |
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| Srry for going slightly off topic, but if i want to buy test kits, I would like to know which parameters do we chk? Which brands are considered to be accurate? How can I source them? |
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rgg
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| Posted: Wed Jul 11, 2007 10:09 am Post subject: Re: DIY PH strips |
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Debarghya,
Lets know the purpose of checking water chemistry... Are you targetting a marine tank to check the water parameters or are you checking them for your planted or a rocky chiclid tank.
Raghu |
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