4dkh Drop Checker DIY?

Discussion in 'General Planted Tank Discussions' started by GlenD, 14 Dec 2019.

  1. GlenD

    GlenD Member

    Joined:
    26 Jun 2019
    Messages:
    168
    Location:
    London
    So I've run out of my drop checker solution.

    Is the below correct?

    1. Add 6g of sodium bicarbonate (NaHCO3) to 500ml RO = 500ml of 400dKH solution.
    2. Then dilute 5ml of 400dkh solution with 495ml H20 to get 500ml of 4dKH solution?
    3. Take 5ml of this into drop checker and add 5 drops of my AP PH test kit?
    Questions...
    1. is the above correct?
    2. if I wanted more than 5ml of the 4dkh solution in my drop check i.e. 5ml, would I need to add another 5 drops of the API PH tester?
    3. if you add more than 5 drops of the API PH tester will it give an incorrect reading or will it just make the colour darker?
    Cheers
    Glen
     
  2. dw1305

    dw1305 Expert

    Joined:
    7 Apr 2008
    Messages:
    9,397
    Location:
    nr Bath
    Hi all,
    Yes, I think it is.
    You need "bromothymol blue" as the pH indicator. It is a narrow range pH indicator (colour change below)
    [​IMG]
    Just add enough bromothymol blue so you can see the colour change, it won't be very many drops.

    I just had a quick look (on a well known auction site) and a 35 mL bottle of bromothymol blue is £6.

    cheers Darrel
     
    GlenD likes this.

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