Question 4 40 points Save Anwer To recrystallise a sample of KoCr20 (potassium m

Question

Question 4 40 points Save Anwer To recrystallise a sample of KoCr20 (potassium m dichromate), a scientist used 250g of water to prepare a saturated solution of potassium dichromate at 80 degrees celsius. The degrees celsius. It is and the filtrate allowed to cool to 20 the mass of a saturated solution at 20 degrees celsius. The mass of precipitated potassium dichromate produced when the saturated solution is cooled from 80 that the potassium dehronate constitues 42.2 % of the mass of a saturated solution at 80 celsius and 11.1 celsius to 20

Explanation / Answer

Mass of K2Cr2O7 to be dissolved in 250 gm water in 80 Deg celcius = 42.4 x 250 /100 = 106 gm

Mass of K2Cr2O7 to be dissolved in 250 gm water in 20 Deg celcius = 11.1 x 250 /100 = 27.75 gm

Mass of  K2Cr2O7 will be precipated in 20 Deg celcius = 106 -27.75 = 78.25 gm

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