need help on these A 245-L barrel of white wine has an initial free SO2 concentr

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need help on these

A 245-L barrel of white wine has an initial free SO2 concentration of 25 ppm and a pH of 3.80. How much SO2 (in grams) should be added to the barrel to result in the required SO2 level?

A 205-L barrel of red wine has an initial free SO2 concentration of 13 ppm and a pHof 3.55. How much SO2 (in grams) should be added to the barrel to result in the required SO2 level?

Gaseous SO2 is highly toxic and can be difficult to handle, so winemakers often use potassium metabisulfite (K2S2O5K2S2O5), also known as KMBS, as a source of SO2 in wine. When KMBS is added to wine, the metabisulfite ion (S2O52) reacts with water to form the bisulfite ion (HSO3). Enter the balanced net ionic equation for the reaction that occurs when the metabisulfite ion reacts with water.

Express your answer as a net ionic equation.

Explanation / Answer

1) 25 ppm equal to 0.025 grams per L

Total volume is 245 L so, 245 x 0.025= 6.125 g SO2 in 245 L

2) 13 ppm equal to 0.013 g/L

205 x 0.013 =2.665 g of SO2 in 204 L

3)K2S2O5 + H2O -----> 2 KHSO3

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