Give a balanced chemical equation for this reaction using condensed structural formulas, and state the IUPAC name of ester $J$.

The following method is used to prepare a pure sample of ester $J$:

• Step 1: Mix $10{cm}^3$ of propan-1-ol with $12{cm}^3$ of ethanoic acid in a reaction flask. Add $4$ drops of concentrated sulfuric acid and some anti-bumping granules. Assemble the reflux chemistry apparatus and heat the mixture.
• Step 2: Transfer the cooled mixture to a separating funnel. Add $25{cm}^3$ of aqueous sodium hydrogencarbonate, stopper the funnel, and shake the mixture.
• Step 3: Run off the organic layer into a beaker, add anhydrous sodium sulfate, and decant the liquid.
• Step 4: Purify the ester using distillation.

Answer the following questions based on this preparation method:

1. Explain the purpose of adding anti-bumping granules in Step 1.
2. State the purpose of adding aqueous sodium hydrogencarbonate in Step 2.
3. Suggest a precaution (with a reason) that should be taken while shaking the mixture in the separating funnel in Step 2.
4. State the function of the anhydrous sodium sulfate in Step 3.
5. Suggest how the purity of ester $J$ can be confirmed during the distillation in Step 4.