Place 100 mL of pyridine in a 250-mL graduated cylinder , and, keeping the pyridine cold in an ice bath, pass in dry sulfur dioxide until the volume reaches 200 mL.
将100ml的吡啶至250ml的量筒中，使吡啶在冰浴中保持冷，加干燥的二氧化硫直至体积达到200ml。
Place 100 mL of pyridine in a 250-mL graduated cylinder , and, keeping the pyridine cold in an ice bath, pass in dry sulfur dioxide until the volume reaches 200 mL.
将100ml的吡啶至250ml的量筒中，使吡啶在冰浴中保持冷，加干燥的二氧化硫直至体积达到200ml。
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