반응이 완료된 후, 상온에서 냉각시킨 후, 2 M HCl을 이용하여 침적물을 생성시킨 뒤 분리하여 세척한 다음 건조시켰다.
After the reaction was completed, the mixture was cooled at room temperature, and a deposit was generated using 2 M HCl, separated, washed, and then dried.