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Cider Digest #1489
Subject: Cider Digest #1489, 9 March 2009
From: cider-request@talisman.com
Cider Digest #1489 9 March 2009
Forum for Discussion of Cider Issues
Dick Dunn, Digest Janitor
Contents:
HDPE vessels (david.pickering@dpi.nsw.gov.au)
TA testing (Andrew Lea)
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Subject: HDPE vessels
From: david.pickering@dpi.nsw.gov.au
Date: Thu, 5 Mar 2009 10:54:41 +1100
The HDPE tanks have a history of use here in Oz for cider. FlexTank
indicate that they have supplied about 60-80KL of tanks to Little
Creatures Cider in Western Australia during recent years.
If you have particular issues you want to discuss, try contacting the
Technical Director (Anthony Flecknoe-Brown) via sales@flextank.com.au
There are various reprints on their website discussing performance of
HDPE and making comparisons with oak and stainless.
http://www.flextank.com.au/Technical.htm
http://www.flextank.com.au/PDF_Files/2-Year-Update.pdf
Cheers
David Pickering
Orange Agricultural Institute, NSW Dept of Primary Industries
Forest Road, Orange, NSW 2800, Australia
david.pickering@dpi.nsw.gov.au
phone 02 6391 3800 fax 02 6391 3899 mobile 042 727 1477
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Subject: TA testing
From: Andrew Lea <andrew@HarpHill.co.uk>
Date: Thu, 05 Mar 2009 17:19:39 +0000
Jason wrote:
> I have, from Peter Mitchells excellent cider making class, the
> following formula, assuming .2M Sodium Hydroxide Solution and 25 ml
> of sample cider, for finding Total Acidity:
>
> Malic acid(gl -1 ) = Volume(ml) of Sodium Hydroxide Solution used x
> 0.536
>
> I recently purchased some Sodium Hydroxide, the strength of which is
> defined as follows: N/10 (0.1N)
> How do I adjust the above formula for the different strength of
> Sodium Hydroxide solution?
The general equation for titration and expression as malic acid is as
follows:
Malic acid (g/L) = (mL of NaOH)* (normality of NaOH)* 67 / (mL of sample).
[In the case of NaOH, which is monobasic, molarity and normality are the
same].
So the equation becomes
(mL of NaOH)* 0.1 * 67 / 25 , or
(mL of NaOH) * 0.268.
In other words the multiplier is half what you were given since the
sodium hydroxide is only half as strong.
Andrew
Wittenham Hill Cider Pages
www.cider.org.uk
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End of Cider Digest #1489
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