Standard format for identification (chemistry)

I passed the exam. It's simple. Don't worry. First, your class will remove one experiment from the three experiments, and then you will draw lots again to do that experiment.

The first experiment is to weigh 50 grams of 5% NaCl solution. Be careful. Weigh 2.5g NaCl and 47.5ml side water of measuring cylinder.

The second is to distinguish lime water from sodium hydroxide. There are two test tubes that take a small amount of liquid and add sodium carbonate. Lime water with white precipitation and sodium hydroxide without white precipitation.

The third is to collect carbon dioxide. Check the air tightness first, and then collect it after assembly and dosing. The drugs used are limestone and dilute hydrochloric acid.

I will kill myself when I type. You have to choose my answer! I'm going to high school, just like you.