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http://indianaquariumhobbyist.com/community/ :: View topic - DIY PH strips
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DIY PH strips
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rgg
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PostPosted: Fri Jul 07, 2006 9:48 am Post subject: DIY PH strips Reply with quote

 HI  all,
   Check  this  out  for  a  RED  cabbage  DIY  PH  strips.
 
 http://www.funsci.com/fun3_en/acids/acids.htm
 
 -Raghu
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harshal
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PostPosted: Fri Jul 07, 2006 11:25 am Post subject:  Reply with quote

 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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PostPosted: Fri Jul 07, 2006 5:32 pm Post subject:  Reply with quote

 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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PostPosted: Fri Jul 07, 2006 5:49 pm Post subject:  Reply with quote

 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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PostPosted: Mon Jul 10, 2006 3:21 pm Post subject:  Reply with quote

 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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PostPosted: Mon Jul 10, 2006 4:01 pm Post subject:  Reply with quote

                                                   
rgg  wrote:                
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                

 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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PostPosted: Mon Jul 24, 2006 2:40 pm Post subject: Re: DIY PH strips Reply with quote

 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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PostPosted: Mon Jul 24, 2006 6:10 pm Post subject: Re: DIY PH strips Reply with quote

 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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PostPosted: Fri Mar 16, 2007 4:52 pm Post subject: Re: DIY PH strips Reply with quote

 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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PostPosted: Fri Mar 16, 2007 10:37 pm Post subject: Re: DIY PH strips Reply with quote

 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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PostPosted: Fri Mar 16, 2007 11:21 pm Post subject: Re: DIY PH strips Reply with quote

 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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PostPosted: Fri Mar 16, 2007 11:47 pm Post subject: Re: DIY PH strips Reply with quote

 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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PostPosted: Sat Mar 17, 2007 1:45 am Post subject: Re: DIY PH strips Reply with quote

 Very Happy   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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PostPosted: Wed Jul 11, 2007 1:09 am Post subject: Re: DIY PH strips Reply with quote

 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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PostPosted: Wed Jul 11, 2007 10:09 am Post subject: Re: DIY PH strips Reply with quote

 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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