In processor titrated water wash method

[RichardP]

Not actually done the titration bit of this method, though I have been using vinegar in the first wash for some time. I need to get some stronger acid, hydrochloric is out for me as I have 316 stainless fittings, so would be looking at sulphuric or phosphoric, both being a similar price volume wise. What's the thoughts on phosphoric? Which would be best for use with stainless?

Also looking at the indicator for the test. Bromthymol blue looks to be best due to the colour change point, next being phenol red.   Any ideas where these can be acquired?

[Head Womble]

Get a soap test kit off Nige, that has Bromthymol blue in it.
Or ask your chemical supplier.

[RichardP]

I thought the stuff in the soap kit was bromophenol blue? Where's Nige??

[nigelb]

I'm here!

Richard..I have sulphuric acid here. FOC. It's brand new sealed battery acid that gets thrown away at work. For the sake of being close enough then bromophenol blue will work just fine. If you want Bromothymol blue I can get that for just under £10 for 500ml.

Mark..the indicator in the soap kits is Bromophenol Blue not Bromothymol Blue

If anybody needs any additional Bromophenol Blue for soap testing I can supply it at about £3.00 plus delivery for 100ml

[RichardP]

Nige, can you get me some bromothymol please? I can pop over when I'm back 4th or 5th, I'll have a bit of the sulphuric to to try out. Thanks.

[Head Womble]

Mark..the indicator in the soap kits is Bromophenol Blue not Bromothymol Blue

Doh, you can tell I'm not a chemist can't you.

[nigelb]

It's an easy mistake to make Mark especially when the pH changes are so close as well the chemical name!

There was a point recently when I thought they were the same animal.

[nigelb]

Nige, can you get me some bromothymol please? I can pop over when I'm back 4th or 5th, I'll have a bit of the sulphuric to to try out. Thanks.

I've just emailed the company and am now awaiting a response regarding collection.

[nathanrobo]

Nige, can you get me some bromothymol please? I can pop over when I'm back 4th or 5th, I'll have a bit of the sulphuric to to try out. Thanks.

I've just emailed the company and am now awaiting a response regarding collection.

Nige,

I've got quite a few bottles of Bromophenol Blue, if you some anything urgently!

[julesandtash]

What's the thoughts on phosphoric?

Phosphoric will be fine - it is just rather expensive. I still have a about 20 litres of 85% phosphoric acid which I will start using once I run out of 96% sulphuric (I have a about 1 litre of that left to use up first).

Phosphoric is certainly less hazardous although still not pleasant and will generate phosphate salts (ie Sodium Phosphate or Potassium Phosphate) in your wash water as opposed to Sulphate ones so would probably be good to put on your plants (especially Potassium Phosphate which is a valuable fertiliser).

[nigelb]

I've got quite a few bottles of Bromophenol Blue, if you some anything urgently!

I too have a ready supply of Bromophenol Blue Nathan....however, my post to Richard was about Bromothymol Blue.

[nathanrobo]

I've got quite a few bottles of Bromophenol Blue, if you some anything urgently!

I too have a ready supply of Bromophenol Blue Nathan....however, my post to Richard was about Bromothymol Blue.

Realise that you have a supply, implied by the soap test kits and earlier posts on this thread.  I was saying that I have a number of bottles of this that I won't be using.

[nigelb]

I'm confused...help me here. What have you got that you wont be using Bromophenol or Bromothymol. Confusion because you quoted a reply to Richardp about Bromothymol!!

[1958steveflying]

I've got quite a few bottles of Bromophenol Blue, if you some anything urgently!

I too have a ready supply of Bromophenol Blue Nathan....however, my post to Richard was about Bromothymol Blue.

Realise that you have a supply, implied by the soap test kits and earlier posts on this thread.  I was saying that I have a number of bottles of this that I won't be using.

Nathan stop reading on your phone and use the lappy..... Richard wants Bromothymol not Bromophenol which you say you have... even though Richard did misspell in his OP about it, lol.

[nathanrobo]