What is the ruling on impurity if it falls into wine and then ferments into vinegar—does it disappear with it? And how can a condition between spouses be nullified after it has been agreed upon and implementation has begun?

The transformation of wine into vinegar purifies it, but the impure substance present in the wine is not purified unless it transforms into something else. As for the condition (al-shart), if it refers to a vow (al-nadhr), then each type of vow has its own specific ruling.