Free SO2 to Molecular SO2 using pH

pHHSO3- (mg/L)SO2 (mg/L)
2.500.000.00
2.550.000.00
2.600.000.00
2.650.000.00
2.700.000.00
2.750.000.00
2.800.000.00
2.850.000.00
2.900.000.00
2.950.000.00
3.000.000.00
3.050.000.00
3.100.000.00
3.150.000.00
3.200.000.00
3.250.000.00
3.300.000.00
3.350.000.00
3.400.000.00
3.450.000.00
3.500.000.00
3.550.000.00
3.600.000.00
3.650.000.00
3.700.000.00
3.750.000.00
3.800.000.00
3.850.000.00
3.900.000.00
3.950.000.00
4.000.000.00
4.050.000.00
4.100.000.00
4.150.000.00
4.200.000.00
4.250.000.00
4.300.000.00
4.350.000.00
4.400.000.00
4.450.000.00
4.500.000.00

Purpose

Use this calculator to calculate molecular SO2 and HSO3- based on Free SO2 for any pH level

Background

When SO2 is added to must, juice or wine, it exists in either a free or a bound form. The free form consists of, molecular SO2 (which is the form active that is active against microorganisms), the HSO3- and the SO3-, all of which exist in a pH dependent equilibrium. Because the percentage of FSO2 that exists as the active molecular form is dependent on the pH, the pH should be mesured prior to SO2. A decrease of pH prior to SO2 addition will result in increase effectiveness of SO2.

REFERENCES:

  • Techniques for chemical analysis and quality monitoring during winemaking (2000) by Patrick Iland, Andrew Ewart, John Sitters, Andrew Markides and Nick Bruer - (Patrick Iland Wine Promotions);

This winemaking calculator is provided to you courtesy of NuVerge Canada Inc.

Disclaimer

Winemaker.Plus calculators purpose is to provide an alternative to user's current method(s). In making any additions or estimating winemaking data, we are strongly urging the user to respect all legislative requirements, follow regulatory health and safety protocols and make additions or estimate winemaking data based on number of sources including and not limited to supplier technical sheets, MSDS's and or local appellation resources. In no event shall Winemaker.Plus or its employees be liable for any direct or/and indirect loss and/or damage arising from the use or/and missuse of calculators in this progressive web application. Winemaker.Plus makes no representation, warranty, or claim that the information available in any of the calculators of this progressive web application is current or accurate. WinemakerPlus is not responsible for any errors or omissions in the resources or information contained in this progressive web application.