Formationof an imine from reaction of analdehyde and an amine proceeds reversibly under slightly acidic conditions. The reaction is reversible due to acid-catalyzed hydrolysis of the imine. Scheme 8.2 shows that imine formation generates an equivalent of water, yet the imine is easily isolated. Given these facts, explain why the imine can still be isolatedfrom the reaction mixture. Weigh and record the mass of a 50 mL beaker and add o-vanillin (4 mmol) to one side of the beaker. Add p-toluidine (4 mmol) to the opposite side of the beaker. Mix the solids by shaking the flask gently. Gently mix the starting materials using a wooden stick until a dry powder is formed. Weigh the beaker, and then recrystallize the crude material from boiling 95% EtOH solution. Isolate the product by vacuum filtration, dry for ~10 min, weigh the dry product, and calculate the % yield of the crude and purified imine.

29.1-12=17.1the answer is this one

The answer to your question really depends on three things: how much water you have, how cold it is to start out, and how cold the things around it are. water actually freezes when it gets to 32 degrees fahrenheit (0 degrees celsius), but the time it takes to get there may be different.  let's start with the first. if you take two glasses, and fill one with a tiny bit of water, and the other about halfway, then put them both in the freezer, the one with less water will freeze first (you can try this at home, but i recommend using plastic cups and not glass ones).  now let's move on to the second part. let's say you have two glasses, and you fill one with really cold water that has been in the refrigerator, and the other with really hot water from the sink. if you put both of them in the freezer, the one that started out colder will freeze first.  for the third part, let's imagine that you have two glasses with the same amount of water in them, and the water is at the same temperature. imagine putting one outside on a really really cold day in georgia, and having a friend in alaska put one outside on the same day. since it would be so much colder in alaska, the glass of water there would freeze before yours.  so, if you took a tiny bit of really cold water in a glass, and put it outside on a cold day in alaska, it would freeze a lot faster than a big glass of hot water outside on a cold day in georgia.