Sammy Islam
Member
Can't seem to find a big bottle anymore, where does everyone get theirs? Or do you make it?
Thanks
Thanks
Nice one, i did see the first one on ebay but avoided it because i've never mixed it before. 🤣
Can you add "too much"I only add a couple of drops of bromo blue to 4k solution, it generally seems enough.
Yes, from what I've read adding too much changes the dkh of the solution, affecting how it works.Can you add "too much"
Yes, from what I've read adding too much changes the dkh of the solution, affecting how it works.
There is no way of knowing, but my guess is that this is the wrong way around, and that your test kit is reading 5 dKH in a 4 dKH solution.Turns out the 4dkh solution i ordered from ebay is actually 5dkh after testing with kh test
You can, but even with accurate scales you are likely to get a more accurate result using <"serial dilution">. I also think it should be 0.03g NaHCO3, it is really easy to get lost in the powers of 10, but @Manuel Arias breaks down the maths in thread linked below.Found some bicarbonate of soda hidden at the back of the cupboard so will try mix my own tomorrow. Easiest way seems to be 0.3g to 500ml DI Water. Seeing as i have accurate scales does that mean i can half that 0.15g to 250ml DI to make a smaller batch of 4dkh water?
Thanks Darrel, makes sense but doesn't explain why the drop checker is dark green rather than verging yellow, so that's why i would like to make my own solution to test.Hi all,
There is no way of knowing, but my guess is that this is the wrong way around, and that your test kit is reading 5 dKH in a 4 dKH solution.
I'd think of it this way. You give me a £1 coin, and rather than accepting it is £1, I weigh it, and say "it weighs as much as £2, so it is actually £2" and give you a pound back. What is more likely? That the coin is counterfeit? or that the scales are wrong?
You can, but even with accurate scales you are likely to get a more accurate result using <"serial dilution">. I also think it should be 0.03g NaHCO3, it is really easy to get lost in the powers of 10, but @Manuel Arias breaks down the maths in thread linked below.
Because NaHCO3 is really cheap to buy I would start with <"3g of NaHCO3 made up to 500 mL with DI water"> to give you a 400 dKH stock solution, and dilute from there.
cheers Darrel
Just by weight. Because water has a density of one, a kilogram of water has a volume of one litre and one gram = one millilitre.but the problem i have is mesuring out the water precisely.
That should tell you. You will have made <"a standard"> that you can use for calibration.so that's why i would like to make my own solution to test.
If you have accurate scales/balance then you can weigh the water. Assume 1.00 gram per ml/cc. I have calibrated glass ware in the past working to three decimal places. B@ll breakingly tedious.measuring out the water precisely.
You pipped me to the reply. I am slow at typing.Just by weight.
This is <"always happening to me">, you spend ages writing a reply and then just before you post it, some-one posted the same thing.You pipped me to the reply. I am slow at typing.
Thanks, I have successfully made 4dkh water, i tested it a few times to make sure. I also doubled the amount of test fluid to 10ml so every drop of indicator is for 0.5dkh.Hi all,
Just by weight. Because water has a density of one, a kilogram of water has a volume of one litre and one gram = one millilitre.
Even in the lab. I use the scientific balances, rather <"than volumetric flasks">, for most things. I only use a pipette now for very small volumes
That should tell you. You will have made <"a standard"> that you can use for calibration.
cheers Darrel