To recrystallise a sample of KoCr-Or (potassium dichromate), a scientist used 25

Question

To recrystallise a sample of KoCr-Or (potassium dichromate), a scientist used 250g of water to prepare a saturated solution of potassium dichromate at 80 degrees ceisius The solution w filtered and the filtrate alowed to cool to 20 degrees celsius, it is known that the potassam dehon ate constitues 42 2 % of the nasof a saturated soluson at ae-ra % of the mass of a saturated solution at 20 degrees celsius. The man of precipitaned ptasium, dichrome prod edrenn, urnesto..ooed-gere ei s dgress celsius is

Explanation / Answer

mass of water to prepare saturated solution=250g

mass of potassium dichromate at 80 deg C=42.2% of mass of solution

mass of potassium dichromate at 20 deg C=11.1 % of mass of solution

mass of potassium dichromate precipitated at 20 deg C=(42.2% -11.1%)= 31.1 % of mass of solution=(31.1/100)* *(250g+mass of potassium dichromate dissolved)

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.